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Defence MRO Companies in London: 36 Active Firms (2026)
Defence MRO companies in London maintain, repair and support military equipment for defence and aerospace customers across the capital.
Procurement usually sits with engineering, operations and contract-management teams rather than a single central buyer. London suppliers in this segment tend to sell to defence primes, aerospace operators, government customers and security-sensitive facilities, with work awarded through framework-style or call-off contracts. Typical engagements are service packages: scheduled maintenance, fault diagnosis, repair programmes, parts support, field engineering and compliance documentation. The buyer is usually paying for equipment availability and evidence of safe work, not just workshop capacity, so audit trails, response times and technical accreditation tend to matter as much as price.
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London has 36 actively trading defence MRO companies in this cohort, a compact market compared with broader business-services categories in the capital. Reported employment totals 501 people, suggesting a base weighted towards specialist engineering and support teams rather than large depot-style employers. Only 3 companies report turnover above £5M, while 2 were incorporated since 2022, so the list is not dominated by very young entrants. That shape fits a contract market where customer trust, facilities access and technical sign-off can take time to build.
Defence MRO work sits in a procurement environment where customer approval, security handling and documentation are part of the service rather than administrative extras. Providers may need to evidence technician competence, parts traceability, controlled-information handling and maintenance history for equipment used by defence, aerospace or security customers. London adds a particular commercial shape: many suppliers are close to headquarters, programme-management teams and specialist subcontractors, while heavier physical maintenance may be coordinated through partner sites outside the capital. The result is a market with a high share of technical support, compliance and coordination work.
The London cohort appears more likely to deepen around specialist sustainment, parts coordination and field-support roles than to become a broad base of heavy maintenance facilities. Contract-led demand tends to favour providers with repeat customer relationships, documented procedures and staff able to work within security-sensitive environments. New entrants may find openings in diagnostics, obsolescence management and niche equipment support, but customer approval cycles can slow commercial momentum. Consolidation is plausible where small engineering teams hold useful permissions or scarce technical skills, although the market still looks relationship-based rather than platform-led.
36
Active firms
2026
3
Above £5M
reported revenue
2
Since 2022
new incorporations
Key facts
About 8% of the trading cohort reports turnover above £5M (3 of 36 firms) — the rest sits below that revenue band.
5% of the cohort was incorporated since 2022 (2 firms), so a sizeable share is in its first few filing cycles.
London defence MRO sits between engineering services, specialist logistics and through-life support.
The work covers maintenance, repair, overhaul and support for military equipment used by defence and aerospace customers.
Buyers tend to value continuity of supply because the segment supports equipment already in service, rather than one-off equipment sales.
The market mixes niche technical contractors with broader service organisations, reflecting the range of support work around defence and aerospace equipment.
Top London defence MRO companies
AAR Services Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides aviation aftermarket services including aircraft maintenance, repair and overhaul, component repair, and engineering support. Supplies and distributes airframe and engine parts and offers…
Serves commercial airlines, business aviation operators, government and military aviation organisations, MRO providers and aerospace OEMs worldwide.
Financial Health
HealthyHealthy · Hiring · 11% CAGR over 4y
Location
Trajectory
5y · 2021–NowProvides engineering design, integration and support services for defence and industrial clients, including data collection systems, electronics, training simulators and lightweight armour. Supplies…
Serves defence organisations, military vehicle operators and industrial customers in sectors where reliability, safety and protection are critical, with explicit coverage for ND Defense customers in…
Financial Health
Insufficient historyInsufficient history
Location
Provides aviation and aerospace services including aircraft design, modification, testing and certification, contract air operations, special mission flights, and VIP charter. Also operates a…
Serves government, defence and security organisations, emergency and disaster response agencies, aerospace engineering customers, and VIP charter clients requiring specialist aviation capability.
Location
STS Aviation Group
Provides aircraft maintenance, repair and overhaul services including base and line maintenance, engine and fuel system work, aircraft interior modifications, engineering and certification support,…
Serves commercial airlines, aircraft operators, MRO providers, OEMs and military aviation organisations worldwide, including buyers responsible for fleet maintenance, engineering, parts supply and…
Location
Caledonian Airborne Systems
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDesigns and manufactures avionics and airborne mission systems for aerospace applications, including maritime surveillance equipment, distress beacons, radar enhancements, displays and cameras.…
Serves government agencies, defence and maritime patrol operators, and aerospace organisations managing fixed-wing and helicopter fleets, including customers in Europe, the Far East and the Americas.
Financial Health
StableStable · 0% CAGR over 2y
Location
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsDesigns, manufactures, and supplies survival and safety equipment, including life rafts, lifejackets, immersion suits, and fire safety systems. Provides inspection, maintenance, and servicing of…
Serves B2B and public-sector customers in safety-critical sectors, including maritime, defence, aviation and offshore energy operators with regulatory compliance needs.
Financial Health
WeakWeak · 0% CAGR over 4y
Location
Provides aviation services to commercial airline operators, including aircraft engineering and modification support, flight crew and maintenance training, technical field services, and sales and…
Serves commercial airlines, aircraft operators and lessors, alongside defence and government aviation customers in the UK, Ireland and globally, plus flight crew and maintenance teams.
Location
Provides aviation and aerospace services including aircraft design, modification, testing and certification, contract air operations, special mission flights, VIP charter, remote sensing and data…
Serves public-sector and commercial customers in defence and security, engineering, disaster response and VIP travel, including organisations needing contract air services and aircraft MRO support.
Financial Health
Insufficient historyInsufficient history
Location
Tods Defence Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns, tests and manufactures advanced composite structures, sonar domes and acoustic stealth materials for naval ships and submarines. Provides engineering design, development testing,…
Serves defence primes, naval shipbuilders and public-sector marine defence organisations involved in ship and submarine programmes.
Financial Health
StrongStrong · Growing, Hiring · 11% CAGR over 4y
Location
FLIGHTCARE LIMITED
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides aircraft maintenance and engineering services for PT6 and piston-powered fixed‑wing aircraft, including inspections, structural and insurance repairs, maintenance control, logbook and…
Serves aircraft owners, fixed-wing aircraft operators, aviation organisations, and insurers needing support for PT6 and piston-powered aircraft up to 13,610 kg.
Financial Health
HealthyHealthy · 3% CAGR over 3y
Location
MB AEROSPACE HOLDINGS LIMITED
Trajectory
2y · 2023–NowFinancial sub-scores
Computed from 2 filingsActs as an intermediate holding company for a group that manufactures precision machined and fabricated aerospace components and assemblies, and provides turbine engine component repair, overhaul and…
Serves B2B aerospace and industrial customers, including major turbine manufacturers, OEMs and suppliers, commercial airlines, defence organisations and space-sector buyers requiring certified…
Financial Health
HealthyHealthy · Hiring · 20% CAGR over 1y
Location
TOP FLIGHT LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides helicopter aviation services including personnel and cargo transport, aerial firefighting and specialised operations. Also offers helicopter maintenance, repair and overhaul, plus pilot and…
Serves B2B and public-sector customers in aviation, defence, emergency response, natural resources and remote operations, plus helicopter pilots, engineers and operators seeking training or…
Financial Health
HealthyHealthy · 0% CAGR over 2y
Location
Am Marine Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsSupplies lifting equipment, naval rigging systems and bespoke military parts to defence and marine sectors. Provides inspection, testing, maintenance and management of lifting equipment, industrial…
Serves governments and defence organisations worldwide, plus marine operators such as cruise ships, super yachts, ferries and Ro-Ro vessels. Also targets industrial organisations with lifting, height…
Financial Health
HealthyHealthy · 0% CAGR over 4y
Location
Provides ground support equipment services for the aviation industry, including rental, sale and leaseback, maintenance and repair, and fleet management. Also sells refurbished airport GSE and…
Serves B2B aviation customers, including airports, airlines and ground handling operators that manage ground support equipment fleets and airport turnaround operations globally.
Location
CHC
Provides helicopter aviation services including offshore crew transport for energy operations, search and rescue missions, emergency medical flights, and utility support. Also offers aircraft…
Sells to offshore energy operators, government departments and emergency service organisations needing helicopter transport, search and rescue, and air medical support. Also serves aircraft owners…
Location
SKYHIGH AEROSPARES LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsSupplies aftermarket aircraft auxiliary power unit (APU) parts and equipment. Provides APU purchasing, sales, leasing and exchange, as well as teardown services, consignment programmes, asset…
Serves B2B aviation customers, including airlines, aircraft operators, MRO providers and asset managers needing aftermarket APU parts, leases, exchanges and related support across international time…
Financial Health
HealthyHealthy
Location
ELBE AVIATION LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides aircraft engineering and maintenance services, including passenger‑to‑freighter conversions for Airbus A330, A320 and A321 aircraft. Designs and manufactures composite aerostructures, floor…
Serves B2B aerospace customers worldwide, including airlines, cargo operators, Airbus and other aircraft industry partners, plus commercial and military aircraft operators needing certified aircraft…
Financial Health
WeakWeak · -68% CAGR over 4y
Location
Austability Group Limited
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsHolding company overseeing subsidiaries that provide operational support services to defence and national security agencies, including expeditionary base operations support, resource acquisition and…
Serves Five Eyes government defence and national security agencies, allied partners, and related diplomatic/security organisations operating overseas in conflict, post-conflict and austere…
Financial Health
StrongStrong · Hiring · 147% CAGR over 3y
Location
Inocea
Provides maritime defence and fleet support services, including operation of combat support vessels and at‑sea logistics for naval fleets. Participates in shipbuilding and icebreaker programmes…
Serves public-sector and commercial maritime customers: sovereign navies, coast guards and government fleet agencies, plus commercial vessel operators in cruise, ferry, LNG, subsea and Arctic…
Location
PR TRADING LIMITED
Trajectory
2y · 2023–NowFinancial sub-scores
Computed from 2 filingsSupplies commercial and military aircraft parts and aerospace equipment, including airframe, avionics, engine and turbine components, rotables, hardware and ground support equipment. Acts as…
Serves airlines, government and military buyers, overhaul facilities, MROs and aerospace OEMs worldwide, including international airline procurement teams.
Financial Health
DistressedDistressed · -40% CAGR over 1y
Location
Aviation Spares & Repairs
Trajectory
5y · 2019–NowFinancial sub-scores
Computed from 5 filingsSupplies aircraft parts, ground support equipment and maintenance tooling to the aviation sector. Distributes products including aircraft jacks, tow tractors, baggage and cargo carts, ground power…
Serves B2B and defence customers in the aviation sector worldwide, including commercial airlines, military aviation operators, airports, ground handlers and aircraft maintenance organisations.
Financial Health
StableStable · 0% CAGR over 6y
Location
FALMOUTH LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides ship repair, maintenance and vessel conversion services, and undertakes marine and defence fabrication and block‑build projects. Also operates port and dock facilities supporting commercial…
Serves B2B and public-sector customers in commercial marine, defence and renewables, including ship owners/operators, naval organisations, bulk industries, cruise and ferry operators, and offshore…
Financial Health
StableStable · 0% CAGR over 4y
Location
HAWK AVIATION EUROPE LIMITED
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsSupplies aftermarket spare parts for commercial, regional and cargo aircraft, including rotables and consumables. Provides sales, exchange and loan of components, repair management through approved…
Serves airlines, cargo operators, regional and commuter aircraft operators, and MRO organisations worldwide, targeting aviation buyers, maintenance teams and surplus inventory managers.
Financial Health
StableStable · -69% CAGR over 4y
Location
STUDIO SOHO INTERNATIONAL LIMITED
Trajectory
5y · 2020–NowSupplies aircraft parts, spares, chemicals, consumables and raw materials for commercial aircraft. Provides sale, exchange and loan of components, repair management through approved MROs, consignment…
Serves airlines, MRO providers and aviation suppliers worldwide, primarily business customers operating or supporting commercial aircraft fleets.
Financial Health
Insufficient historyInsufficient history
Location
Eftec Aero Limited
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProvides aircraft spare parts supply and aviation support services including maintenance, repair and overhaul (MRO), engine and APU repair, aircraft teardown and recycling, brokerage of aircraft and…
Serves B2B customers in the aviation sector worldwide, including large aviation corporations, smaller growing companies, aircraft operators and maintenance organisations.
Financial Health
StableStable · 0% CAGR over 2y
Location
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProvides maintenance, repair and overhaul services for business jets, including scheduled inspections, technical management and continuing airworthiness management (CAMO). Supports executive jet…
Serves executive and business jet operators, corporate flight departments and aviation management firms operating aircraft such as Dassault Falcons, including UK, Isle of Man, Guernsey, Bermuda and…
Financial Health
StableStable · 0% CAGR over 2y
Location
AEROSPACE RESOURCES LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides aerospace and aviation services including aerial surveillance, satellite earth observation support, aircraft spares supply, engineering and technical consultancy. Coordinates aerospace…
Serves B2B and public sector organisations across the aviation and aerospace sectors, including civilian and defence customers. Targets organisations of all sizes needing aircraft spares,…
Financial Health
WeakWeak · -57% CAGR over 2y
Location
RB&AS Consultants Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides engineering management consultancy covering safety and risk management, portfolio, programme and project management (P3M), supportability engineering, and C4I2 and digital services for…
Serves government organisations and businesses in highly regulated sectors, especially UK defence nuclear, marine, weapons and logistics, nuclear energy, rail, aviation and infrastructure asset…
Financial Health
DistressedDistressed · 0% CAGR over 4y
Location
Sd Direct Ltd
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsProvides satellite communications and connectivity services for aviation, government, and land or maritime operations. Supplies aircraft antenna systems, cabin routers, and network services, and…
Serves military, government and civilian public-sector organisations, including defence agencies, head-of-state aircraft operators, UAV programmes and emergency or public service teams.
Financial Health
DistressedDistressed · 0% CAGR over 1y
Location
Artios Global Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides unexploded ordnance (UXO) risk management services including preliminary and detailed risk assessments, mitigation planning and on-site support. Delivers mine action operations, bomb…
Serves government bodies, UN agencies, international NGOs and organisations managing land, infrastructure or security risks, including clients in mine action, stabilisation, rule of law, national…
Financial Health
StableStable · Hiring · 18% CAGR over 4y
Location
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsSupplies used serviceable aircraft parts including avionics, nacelles and landing gear; provides aircraft and engine leasing, component distribution, maintenance, repair and overhaul services,…
Serves airlines, aircraft operators, aircraft lessors and aviation MRO organisations worldwide that need commercial aircraft components, engines, leasing, finance, maintenance and overhaul support.
Financial Health
StableStable · 0% CAGR over 4y
Location
EXSEL DESIGN AND INTEGRATION LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns and integrates electromechanical, electronic and communications systems for vehicles, mobile platforms and containerised solutions. Provides vehicle modifications, equipment ruggedisation,…
Serves defence and government procurement teams, military vehicle operators, and specialist civilian organisations with severe-environment or rapid-deployment requirements, including ND Defense users…
Financial Health
StrongStrong · Hiring · 20% CAGR over 4y
Location
London Elstree Aviation Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides CAA Part-CAO approved maintenance for fixed‑wing aircraft, including inspections, servicing, repairs and airworthiness work. Supports the operation and upkeep of aircraft for private owners…
Serves private fixed-wing aircraft owners and commercial aircraft operators, including continuing customers using London Elstree Aerodrome.
Financial Health
WeakWeak · Hiring · 32% CAGR over 4y
Location
Avantus Aerospace
Manufactures and supplies C‑class components for aerospace and defence, including precision sheet metal parts, machined components, laminated and solid shims, composite parts and specialty fasteners,…
Sells to B2B customers in the aerospace and defence sectors, including aircraft manufacturers, defence contractors and supply-chain teams requiring C-Class and composite parts.
Location
TAMCO Services Limited
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides technical consulting and asset management services for the aircraft leasing lifecycle, including lease return and acceptance support, pre‑purchase and mid‑lease inspections, repossession…
Serves B2B aviation customers, including aircraft leasing companies, airlines, MROs, OEMs and asset owners needing technical support across aircraft leasing, purchasing, maintenance and conversion…
Financial Health
StrongStrong
Location
FUTURIS AVIATION LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides aircraft and flight simulator leasing for fixed‑wing aircraft and helicopters, alongside onsite aircraft maintenance and repair, pilot training, UAV services, and aviation data and AI tools…
Serves B2B aviation customers, including flying schools, airlines and other aircraft operators seeking leased aircraft or simulators, onsite maintenance, training and data tools. Also targets…
Financial Health
HealthyHealthy · -14% CAGR over 4y
Location
Provides engineered products and technical services including remotely operated vehicles, subsea equipment, inspection and asset integrity services, autonomous mobile robots, and aerospace…
Serves B2B and government buyers in oil and gas, renewable energy, material handling and logistics, autonomous transit, aerospace, defense, and science/research sectors.
Location
B&H Worldwide
Provides specialised logistics services for the aviation and aerospace sector, including time‑critical AOG shipments, transport of aircraft engines and components, warehousing and inventory…
Serves aviation and aerospace businesses worldwide, including organisations managing aircraft parts, engines, avionics, components and AOG/time-critical inventory across airline, MRO, OEM and…
Location
B&H Worldwide
Provides logistics services for the aviation and aerospace sector, including time‑critical AOG shipments, air charter, on‑board courier delivery, engine transport, warehousing, forward stocking…
Serves B2B customers in the global aviation and aerospace sector, including organisations managing aircraft engines, avionics, components and consumables with time-critical inventory needs.
Location
HARMON UK LTD
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides precision engineering services including CNC machining, CNC grinding, metal fabrication, surface treatments and non‑destructive testing. Manufactures prototype, small-batch and production…
Serves B2B engineering customers in aerospace, defence, rail, marine/naval, medical, oil and gas, renewable energy and commercial sectors, from prototype and small-batch needs to full production…
Financial Health
StableStable · -16% CAGR over 4y
Location
Provides engineering, scientific and technology services for aerospace, rail, national security and cybersecurity sectors, including systems engineering, safety certification, simulation, sensor…
Serves government agencies, defence and national security organisations, aerospace and commercial launch operators, rail infrastructure owners/operators, and critical infrastructure teams.
Location
MASS (UK) LTD
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProvides defence and security technology services including electronic warfare and cyber‑electromagnetic activities training, countermeasures development, mission data management, secure software…
Serves defence organisations, government agencies and security-conscious enterprises, including UK MOD and allied military teams operating in high-threat, classified and sovereign IT environments.
Financial Health
HealthyHealthy · Hiring · 12% CAGR over 2y
Location
Worldwide Holding Ltd
Trajectory
5y · 2019–NowFinancial sub-scores
Computed from 5 filingsProvides logistics services for the aviation and aerospace sector, specialising in time‑critical transport of aircraft parts and equipment. Services include AOG logistics, warehousing and inventory…
Serves businesses in the global aviation and aerospace market, particularly organisations managing time-critical aircraft engines, avionics, components and consumables.
Financial Health
StrongStrong
Location
Provides subsea inspection, maintenance and repair services, non‑destructive testing, remotely operated vehicles, and engineered equipment for offshore oil and gas operations, along with robotics,…
Serves B2B and public-sector customers in oil and gas, renewable energy, aerospace, defense, manufacturing, logistics, autonomous transit, and science and research sectors.
Location
Aerogility
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsDevelops AI‑based decision support and digital twin software for aviation and defence organisations. The platform models fleets, assets, personnel and maintenance operations to run scenario planning,…
Serves enterprise aviation organisations, including airlines, defence operators and aircraft OEMs, plus owners of complex asset fleets with fleet, MRO and lifecycle planning needs.
Financial Health
HealthyHealthy · Hiring · 5% CAGR over 5y
Location
Provides inspection, non-destructive testing (NDT), and asset integrity management services for offshore energy infrastructure, including subsea inspection, remotely operated vehicle (ROV)…
Serves enterprise and government customers in oil and gas, renewable energy, material handling and logistics, autonomous transit, aerospace, defense, and science and research sectors.
Location
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How London defence MRO companies work and how to sell to them
What they do
Defence MRO firms earn revenue from keeping equipment usable, certifiable and documented over its service life. Work is usually sold as contracted support rather than one-off repair alone, with pricing shaped by retainers, call-off rates, fixed-price work packages, parts margins and field-engineering days. A London provider may act as a technical coordinator, specialist repair house or support partner, depending on what can be handled in-house and what is passed to approved workshops. Margins tend to depend on utilisation, parts availability, rework control and the cost of maintaining security and quality systems, so commercial conversations often sit close to operational delivery.
Who they sell to
Most buyers are organisations with assets that cannot simply be taken out of service when faults appear: defence contractors, aerospace operators, public-sector bodies and private facilities with security-sensitive equipment. Decision-making usually involves engineering heads, programme managers, operations directors, procurement teams and contract owners, with finance joining when service commitments or liability terms are material. Contracts are typically won through direct relationships, approved supplier lists, framework competitions or formal tenders. Sales cycles are often measured in months rather than weeks because buyers need evidence of competence, traceability, insurance, access controls and the ability to handle controlled information.
What they buy
Most defence MRO firms tend to spend on systems and services that reduce delivery risk rather than on broad growth tooling alone. Relevant categories include asset and maintenance-management software, quality-management systems, document control, parts inventory, secure collaboration, cyber security, project accounting, workforce scheduling, CRM for contract pipelines and reporting tools for service performance. They may also buy specialist recruitment, vetting support, bid-writing, legal advice on public procurement, insurance, facilities compliance, calibration services, logistics and technical training. Sellers should expect a practical buying culture: products that fit existing approval processes and evidence requirements usually land better than generic productivity claims.
Why and how to sell to them
Defence MRO buyers tend to evaluate suppliers when contract volumes change, a new framework is pursued, technicians are added, audit findings create remediation work, or parts shortages expose weak planning. Leadership changes and movement into larger government or aerospace contracts can also trigger spending, particularly where manual spreadsheets and informal document stores no longer satisfy customer scrutiny. Outbound works better when it starts from availability, traceability, approval burden or bid risk, rather than generic cost saving. London firms may value offers that help a compact technical team look contract-ready to larger customers without adding unnecessary process.
How this list is built
Data sources
This list is built from UK Companies House filings, XBRL accounts data, and semantic analysis of each company's public website. Revenue and headcount figures come from the most recent filed accounts; where the company has not filed, values are estimated using a model trained on filed history and peer benchmarks and are labelled as estimates.
Classification
Rather than relying solely on SIC codes, Firmbase classifies each company semantically: the company's website is crawled, an AI model reads what the company actually sells, and the company is placed into the relevant industry and subsectors. SIC codes are used as one signal but not the only one. This means a company that registered under a generic SIC code but pivoted into (for example) fintech is correctly identified as fintech, not as its original SIC category.
Freshness
The underlying company data is refreshed from Companies House continuously; filings appear in the list within days of submission. The curated list ordering is regenerated when the underlying data moves meaningfully (company count changes by more than 5%, a new company enters the top-ranked segment, or the filed-revenue numbers for the top firms change). You can see the last-updated timestamp near the top of the page.
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Frequently asked questions
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