Company lists · Data refreshed September 2026

Top 25 Iso certification consulting firms based in the United Kingdom

Name: Iso certification consulting firms based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 1,443 companies tracked

RevenueBase identified 1,443 iso certification consulting firms headquartered in the United Kingdom as of September 2026 and tracks 38,868 professional contacts across them, including 14,037 with verified work emails. London is the largest hub.

This list covers iso certification consulting firms headquartered in the United Kingdom, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 28, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 28, 2026 86% judged on-target in blind review

1,443Companies

38,868Contacts tracked

14,037Verified emails

Explore this list → Free signup · no credit card · 500 free credits

The 25 largest iso certification consulting firms based in the United Kingdom

Ranked by team size

Top 25 of 1,443 iso certification consulting firms based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to iso certification consulting firms: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Intertek	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	10001+	23,155 contacts →
	Indirect evidence “Intertek is a leading Total Quality Assurance provider to industries worldwide.” Source: RevenueBase Database · checked Sep 28, 2026
2	Element Materials Technology	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	5,001-10,000	4,200 contacts →
	Partial evidence “The Element Materials Technology Group is one of the world’s leading global providers of testing, inspection, and certification services for a diverse range of products…” Source: RevenueBase Database · checked Sep 28, 2026
3	Socotec UK & Ireland	Indirect evidence	Burton Upon Trent, United KingdomHQ checked Sep 28, 2026	1,001-5,000	844 contacts →
	Indirect evidence “SOCOTEC UK is a network of industry-leading experts we empower ambitious businesses at every stage of the asset lifecycle.” Source: RevenueBase Database · checked Sep 28, 2026
4	British Engineering Services Group	Partial evidence	Warrington, United KingdomHQ checked Sep 28, 2026	1,001-5,000	776 contacts →
	Partial evidence “Testing, inspection, certification and compliance is our core business so that’s what gets 100% of our focus.” Source: RevenueBase Database · checked Sep 28, 2026
5	UKAS	Indirect evidence	Staines-upon-thames, United KingdomHQ checked Sep 28, 2026	201-500	445 contacts →
	Indirect evidence “UKAS is the world’s leading #accreditation body delivering confidence in products and services, and supporting global value chains.” Source: RevenueBase Database · checked Sep 28, 2026
6	The Citation Group	Indirect evidence	Wilmslow, United KingdomHQ checked Sep 28, 2026	1,001-5,000	291 contacts →
	Indirect evidence “The Citation Group offer unrivalled compliance and quality services to over businesses across the UK, Australia, New Zealand, and Canada.” Source: RevenueBase Database · checked Sep 28, 2026
7	NQA	Partial evidence	Dunstable, United KingdomHQ checked Sep 28, 2026	501-1,000	267 contacts →
	Partial evidence “NQA is a leading global certification body, respected for providing flexible and supportive certification and training services that are technically advanced and meet the needs of…” Source: RevenueBase Database · checked Sep 28, 2026
8	Hqts Group	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	1,001-5,000	250 contacts →
	Partial evidence “Since 1987 HQTS has delivered product inspections, factory audits, testing and quality consulting throughout Asia.” Source: RevenueBase Database · checked Sep 28, 2026
9	Shirley Parsons	Indirect evidence	Aylesbury, United KingdomHQ checked Sep 28, 2026	51-200	185 contacts →
	Indirect evidence “Shirley Parsons is a global professional services firm with expertise in Health & Safety, Quality, Sustainability and Business Improvement.” Source: RevenueBase Database · checked Sep 28, 2026
10	Warringtonfire	Partial evidence	Warrington, United KingdomHQ checked Sep 28, 2026	201-500	177 contacts →
	Partial evidence “Warringtonfire is proud to be part of Element Materials Technology, the leader in Testing, Inspection, Certification and Calibration services.” Source: RevenueBase Database · checked Sep 28, 2026
11	British Board Of Agrément	Indirect evidence	Croxley Park, United KingdomHQ checked Sep 28, 2026	51-200	165 contacts →
	Indirect evidence “The British Board of Agrément (BBA) drives industry safety and quality by providing services that help clients through enabling innovation, identifying risk and demonstrating…” Source: RevenueBase Database · checked Sep 28, 2026
12	Kiwa UK	Partial evidence	Cheltenham, United KingdomHQ checked Sep 28, 2026	201-500	161 contacts →
	Partial evidence “Kiwa Ltd is part of the Kiwa Group, a global top 20 Testing, Inspection and Certification (TIC) organisation.” Source: RevenueBase Database · checked Sep 28, 2026
13	Amtivo Group	Strong evidence	West Malling, United KingdomHQ checked Sep 28, 2026	201-500	138 contacts →
	Strong evidence “Amtivo Group provides expert certification services for ISO standards, as well as training and related services.” Source: RevenueBase Database · checked Sep 28, 2026
14	Mcadam Design LTD	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	124 contacts →
	Indirect evidence “Established in 1963, McAdam initially focused on Civil Engineering Projects with Architecture added as a discipline in 1975.” Source: RevenueBase Database · checked Sep 28, 2026
15	Citation ISO Certification	Strong evidence	Norwich, United KingdomHQ checked Sep 28, 2026	51-200	115 contacts →
	Strong evidence “We believe in keeping ISO certification simple, so that's exactly what we do.” Source: RevenueBase Database · checked Sep 28, 2026
16	BRCGS	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	105 contacts →
	Partial evidence “BRCGS is a leading brand and consumer protection organisation, used by certificated suppliers over 130 countries, with certification issued through a global network of accredited…” Source: RevenueBase Database · checked Sep 28, 2026
17	ERM CVS	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	100 contacts →
	Partial evidence “ERM CVS provides science-based, independent assurance, verification certification and training services for the world’s leading organizations.” Source: RevenueBase Database · checked Sep 28, 2026
18	Isoqar	Indirect evidence	Manchester, United KingdomHQ checked Sep 28, 2026	51-200	99 contacts →
	Indirect evidence “Our reputation for providing outstanding service explains why clients who joined us when we first opened our doors in 1993 are still with us today.” Source: RevenueBase Database · checked Sep 28, 2026
19	APM Group	Indirect evidence	High Wycombe, United KingdomHQ checked Sep 28, 2026	51-200	94 contacts →
	Indirect evidence “We are a global leader for best practice solutions.” Source: RevenueBase Database · checked Sep 28, 2026
20	AES Sustainability Consultants	Indirect evidence	Tiverton, United KingdomHQ checked Sep 28, 2026	51-200	92 contacts →
	Indirect evidence “AES Sustainability Consultants is a leading technical consultancy that delivers value engineered solutions across the homebuilding and construction industries.” Source: RevenueBase Database · checked Sep 28, 2026
21	Phenna Group	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	5,001-10,000	89 contacts →
	Partial evidence “Phenna Group is a global family of specialist businesses delivering Testing, Inspection, Certification and Compliance (TICC) services to customers worldwide.” Source: RevenueBase Database · checked Sep 28, 2026
22	Aegis Rail	Indirect evidence	Derby, United KingdomHQ checked Sep 28, 2026	51-200	79 contacts →
	Indirect evidence “AEGIS is a member of the IKOS Group, a global consultancy business with its Headquarters in Paris, France.” Source: RevenueBase Database · checked Sep 28, 2026
23	Assurity Consulting LTD	Partial evidence	Horsham, United KingdomHQ checked Sep 28, 2026	51-200	77 contacts →
	Partial evidence “Founded in 1986, Assurity Consulting is an independent workplace compliance consultancy specialising in health, safety and environmental solutions, partnering with responsible…” Source: RevenueBase Database · checked Sep 28, 2026
24	NSI	Partial evidence	Maidenhead, United KingdomHQ checked Sep 28, 2026	51-200	72 contacts →
	Partial evidence “NSI is the UK’s most recognised certification body for fire and security.” Source: RevenueBase Database · checked Sep 28, 2026
25	Ligtas Consultancy & Training	Indirect evidence	Cardiff, United KingdomHQ checked Sep 28, 2026	51-200	64 contacts →
	Indirect evidence “Ligtas: Safety Beyond Compliance At Ligtas, we help organisations take control of health, safety, and fire risk, simplifying compliance, protecting people, and creating a stronger…” Source: RevenueBase Database · checked Sep 28, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: iso certification consulting firms. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names iso certification consulting firms.
Partial evidence: Its own public description names part of iso certification consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name iso certification consulting firms. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 1,443 iso certification consulting firms based in the United Kingdom

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 14,037 reachable decision-makers.

Free signup · no credit card

View the full list →

Iso certification consulting firms based in the United Kingdom at a glance

As of Sep 28, 2026

36.1%Verified-email coverage

26.9Average contacts per company

1-10Median size (employees)

13.9%Largest-city concentration · London

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

1,118

11-50

222

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured worldwide rather than for United Kingdom, so it is reported there. Company counts and contact totals on this page are exact for United Kingdom, over 1,443 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among iso certification consulting firms, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in the United Kingdom whose own description of what they do matches “iso certification consulting firms”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names iso certification consulting firms), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among iso certification consulting firms, and records with no verified work email. Companies headquartered outside United Kingdom are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 14,037 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 28, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Iso certification consulting firms by metro

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names iso certification consulting firms, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many iso certification consulting firms are there based in the United Kingdom?

RevenueBase identified 1,443 iso certification consulting firms headquartered in the United Kingdom as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Intertek, headquartered in London, tops this list with the largest team on record.

Which city has the most iso certification consulting firms?

London leads with 200 headquartered companies, followed by Manchester (35) and Aberdeen (23).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 14,037 verified decision-maker contacts tracked across these 1,443 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 28, 2026.

Ready to reach these companies? Verified emails and direct dials for all 1,443 iso certification consulting firms based in the United Kingdom. Start with a free account, no credit card.

Download this list →

Related lists

Iso certification consulting firms by geography

Browse the directory

About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.