Company lists · Data refreshed September 2026

Top 25 Iso audit consulting companies based in the United Kingdom

Name: Iso audit consulting companies 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 926 companies tracked

RevenueBase identified 926 iso audit consulting companies headquartered in the United Kingdom as of September 2026 and tracks 37,335 professional contacts across them, including 12,183 with verified work emails. London is the largest hub.

This list covers iso audit consulting companies 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

926Companies

37,335Contacts tracked

12,183Verified emails

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The 25 largest iso audit consulting companies based in the United Kingdom

Ranked by team size

Top 25 of 926 iso audit consulting companies 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 audit consulting companies: 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	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	5,001-10,000	4,200 contacts →
	Indirect 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	Indirect evidence	Warrington, United KingdomHQ checked Sep 28, 2026	1,001-5,000	776 contacts →
	Indirect 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	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
6	Hqts Group	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	1,001-5,000	250 contacts →
	Strong evidence “Since 1987 HQTS has delivered product inspections, factory audits, testing and quality consulting throughout Asia.” Source: RevenueBase Database · checked Sep 28, 2026
7	Warringtonfire	Indirect evidence	Warrington, United KingdomHQ checked Sep 28, 2026	201-500	177 contacts →
	Indirect 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
8	Amtivo Group	Partial evidence	West Malling, United KingdomHQ checked Sep 28, 2026	201-500	138 contacts →
	Partial evidence “Amtivo Group provides expert certification services for ISO standards, as well as training and related services.” Source: RevenueBase Database · checked Sep 28, 2026
9	Citation ISO Certification	Partial evidence	Norwich, United KingdomHQ checked Sep 28, 2026	51-200	115 contacts →
	Partial evidence “We believe in keeping ISO certification simple, so that's exactly what we do.” Source: RevenueBase Database · checked Sep 28, 2026
10	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
11	Phenna Group	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	5,001-10,000	89 contacts →
	Indirect 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
12	Irca International Register Of Certificated Auditors	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	88 contacts →
	Indirect evidence “Your partners in quality.” Source: RevenueBase Database · checked Sep 28, 2026
13	Baines Simmons	Partial evidence	Bracknell, United KingdomHQ checked Sep 28, 2026	51-200	74 contacts →
	Partial evidence “Baines Simmons is a world-leading aviation safety consultancy, specialising in regulations, compliance, safety management, training, consulting and outsourcing.” Source: RevenueBase Database · checked Sep 28, 2026
14	Minton, Treharne & Davies Group	Indirect evidence	Cardiff, United KingdomHQ checked Sep 28, 2026	51-200	66 contacts →
	Indirect evidence “The Minton Treharne & Davies Group provide scientific consultancy, surveying and testing services to a worldwide client base from our offices in the UK, USA and Asia.” Source: RevenueBase Database · checked Sep 28, 2026
15	FQM LTD	Indirect evidence	Glasgow, United KingdomHQ checked Sep 28, 2026	11-50	52 contacts →
	Indirect evidence “FQM is a #QHSE (#Quality,#Health,#Safety,#Security and #Environmental compliance software, consultancy, coaching & training organisation, focused on delivering cost effective…” Source: RevenueBase Database · checked Sep 28, 2026
16	International Associates Limited	Partial evidence	Glasgow, United KingdomHQ checked Sep 28, 2026	51-200	50 contacts →
	Partial evidence “International Associates (IA) is a leading provider of assessment, audit, verification, certification and training services.” Source: RevenueBase Database · checked Sep 28, 2026
17	Zigzag QA	Indirect evidence	Abingdon, United KingdomHQ checked Sep 28, 2026	11-50	47 contacts →
	Indirect evidence “ZigZag QA is your trusted worldwide quality leader, offering true global reach and unrivaled expertise to reduce risk and efforts.” Source: RevenueBase Database · checked Sep 28, 2026
18	GCS Compliance	Indirect evidence	Rochester, United KingdomHQ checked Sep 28, 2026	11-50	47 contacts →
	Indirect evidence “GCS Compliance Ltd are a specialist independent auditing company providing quality safety, expert technical, compliance management consultancy services and professional training…” Source: RevenueBase Database · checked Sep 28, 2026
19	Opus Safety	Indirect evidence	Birmingham, United KingdomHQ checked Sep 28, 2026	11-50	40 contacts →
	Indirect evidence “Opus Safety helps businesses simplify health and safety through consultancy, technology and hands-on support.” Source: RevenueBase Database · checked Sep 28, 2026
20	ISO Quality Services LTD ISO QSL	Partial evidence	Worcester, United KingdomHQ checked Sep 28, 2026	11-50	37 contacts →
	Partial evidence “ISO Quality Services Limited specialise in helping businesses improve through the implementation of ISO and BS EN Management Standards, ISO consultancy and ISO training, helping…” Source: RevenueBase Database · checked Sep 28, 2026
21	Celnor Group	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	1,001-5,000	34 contacts →
	Indirect evidence “We’re an international service provider in the Testing, Inspection, Certification and Compliance (TICC) sector.” Source: RevenueBase Database · checked Sep 28, 2026
22	Occam Group	Partial evidence	Bristol, United KingdomHQ checked Sep 28, 2026	11-50	30 contacts →
	Partial evidence “Providers of proportionate and pragmatic integrated assurance support, advice and audit.” Source: RevenueBase Database · checked Sep 28, 2026
23	Exveritas	Indirect evidence	Wrexham, United KingdomHQ checked Sep 28, 2026	11-50	28 contacts →
	Indirect evidence “ExVeritas delivers integrated certification, training, and safety advisory services for high-hazard industries worldwide.” Source: RevenueBase Database · checked Sep 28, 2026
24	Clear Quality Limited	Partial evidence	Rotherham, United KingdomHQ checked Sep 28, 2026	11-50	28 contacts →
	Partial evidence “Clear Quality is a professional ISO Consultancy business and Prime Training provider based in South Yorkshire.” Source: RevenueBase Database · checked Sep 28, 2026
25	Verita	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	28 contacts →
	Indirect evidence “Verita is the leading independent consultancy for regulated organisations in the UK.” 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 audit consulting companies. 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 audit consulting companies.
Partial evidence: Its own public description names part of iso audit consulting companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name iso audit consulting companies. 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 926 iso audit consulting companies based in the United Kingdom

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Iso audit consulting companies based in the United Kingdom at a glance

As of Sep 28, 2026

32.6%Verified-email coverage

40.3Average contacts per company

1-10Median size (employees)

16.6%Largest-city concentration · London

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

703

11-50

150

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 926 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 audit consulting companies, 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 audit consulting companies”. 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 audit consulting companies), 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 audit consulting companies, 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, 12,183 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 audit consulting companies 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 audit consulting companies, 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 audit consulting companies are there based in the United Kingdom?

RevenueBase identified 926 iso audit consulting companies 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 audit consulting companies?

London leads with 154 headquartered companies, followed by Manchester (26) and Aberdeen (16).

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 12,183 verified decision-maker contacts tracked across these 926 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.

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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.