Company lists · Data refreshed September 2026

Top 25 Professional certification companies based in the United Kingdom

Name: Professional certification 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 20, 2026 117 companies tracked

RevenueBase identified 117 professional certification companies headquartered in the United Kingdom as of September 2026 and tracks 2,156 professional contacts across them, including 655 with verified work emails. London is the largest hub.

This list covers professional certification 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 20, 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 20, 2026 86% judged on-target in blind review

117Companies

2,156Contacts tracked

655Verified emails

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The 25 largest professional certification companies based in the United Kingdom

Ranked by team size

Top 25 of 117 professional certification companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to professional certification 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	Nebosh	Indirect evidence	Leicester, United KingdomHQ checked Sep 20, 2026	51-200	415 contacts →
	Indirect evidence “The National Examination Board in Occupational Safety and Health (NEBOSH) is a leading global organisation, which provides health, safety and environmental qualifications.” Source: RevenueBase Database · checked Sep 20, 2026
2	NQA	Partial evidence	Dunstable, United KingdomHQ checked Sep 20, 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 20, 2026
3	Amtivo Group	Partial evidence	West Malling, United KingdomHQ checked Sep 20, 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 20, 2026
4	Apmg International	Strong evidence	High Wycombe, United KingdomHQ checked Sep 20, 2026	51-200	132 contacts →
	Strong evidence “APMG International is a leading provider of professional certifications and best practice solutions which are available as self-study exams through APMG, or as training courses…” Source: RevenueBase Database · checked Sep 20, 2026
5	Stroma Certification	Partial evidence	Wakefield, United KingdomHQ checked Sep 20, 2026	201-500	128 contacts →
	Partial evidence “Elmhurst Energy and Stroma Certification have merged.” Source: RevenueBase Database · checked Sep 20, 2026
6	CREST	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	501-1,000	118 contacts →
	Indirect evidence “CREST is an international not-for-profit, membership body representing the global cyber security industry.” Source: RevenueBase Database · checked Sep 20, 2026
7	APM Group	Indirect evidence	High Wycombe, United KingdomHQ checked Sep 20, 2026	51-200	94 contacts →
	Indirect evidence “We are a global leader for best practice solutions.” Source: RevenueBase Database · checked Sep 20, 2026
8	NSI	Partial evidence	Maidenhead, United KingdomHQ checked Sep 20, 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 20, 2026
9	BM Trada Certification	Partial evidence	Hughenden, United KingdomHQ checked Sep 20, 2026	501-1,000	62 contacts →
	Partial evidence “BM TRADA is proud to be part of Element, the market leader in Testing, Inspection, and Certification services.” Source: RevenueBase Database · checked Sep 20, 2026
10	SSAIB	Partial evidence	Whitley Bay, United KingdomHQ checked Sep 20, 2026	51-200	36 contacts →
	Partial evidence “SSAIB (Security Systems and Alarms Inspection Board) is the leading certification body for organisations providing security systems and services, fire detection and alarm systems…” Source: RevenueBase Database · checked Sep 20, 2026
11	The British Institute Of Recruiters	Strong evidence	Manchester, United KingdomHQ checked Sep 20, 2026	11-50	32 contacts →
	Strong evidence “The British Institute of Recruiters (BIOR) is the professional body for staffing and recruitment, operating the Recruitment Certification Scheme for agencies and individual…” Source: RevenueBase Database · checked Sep 20, 2026
12	DCD Academy	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	11-50	30 contacts →
	Indirect evidence “DCD Academy is the data center industry’s premier workforce development partner.” Source: RevenueBase Database · checked Sep 20, 2026
13	Exveritas	Partial evidence	Wrexham, United KingdomHQ checked Sep 20, 2026	11-50	28 contacts →
	Partial evidence “ExVeritas delivers integrated certification, training, and safety advisory services for high-hazard industries worldwide.” Source: RevenueBase Database · checked Sep 20, 2026
14	ADISA	Partial evidence	Harpenden, United KingdomHQ checked Sep 20, 2026	1-10	21 contacts →
	Partial evidence “Launched in 2010, ADISA is a UKAS accredited certification body operating including certification to a Standard 8.0 which is a UK GDPR Certification Scheme formally recognised by…” Source: RevenueBase Database · checked Sep 20, 2026
15	TWI Certification LTD	Partial evidence	Cambridge, United KingdomHQ checked Sep 20, 2026	11-50	20 contacts →
	Partial evidence “TWI Certification Ltd (TWI CL), is a wholly-owned subsidiary of The Welding Institute (TWI), formed in 1993 to exemplify the independence and impartiality required to deliver…” Source: RevenueBase Database · checked Sep 20, 2026
16	QA International Certification Limited	Partial evidence	Darlington, United KingdomHQ checked Sep 20, 2026	11-50	16 contacts →
	Partial evidence “QA International Certification Limited is an accredited certification body issuing internationally recognised accredited certificates to companies across a wide range of…” Source: RevenueBase Database · checked Sep 20, 2026
17	Glocert International	Partial evidence	London, United KingdomHQ checked Sep 20, 2026	11-50	14 contacts →
	Partial evidence “Glocert International is an emerging leader in the Testing, Inspection and Certification (TIC) industry.” Source: RevenueBase Database · checked Sep 20, 2026
18	Crystal&co	Indirect evidence	Harrow, United KingdomHQ checked Sep 20, 2026	11-50	9 contacts →
	Indirect evidence “We provide training and qualifications for all levels, helping people gain the skills they need to succeed in their careers.” Source: RevenueBase Database · checked Sep 20, 2026
19	Standards International LTD	Indirect evidence	Weston, United KingdomHQ checked Sep 20, 2026	1-10	8 contacts →
	Indirect evidence “We believe everyone has the power to realise their extraordinary potential.” Source: RevenueBase Database · checked Sep 20, 2026
20	System Certification Services LTD	Partial evidence	Ballinderry Road, United KingdomHQ checked Sep 20, 2026	11-50	7 contacts →
	Partial evidence “SCS provide accredited certification services which add value to Client organisations by challenging their management systems, in accordance with the relevant standard and in…” Source: RevenueBase Database · checked Sep 20, 2026
21	Qsrmc - CPC - Specc	Partial evidence	Hampton, United KingdomHQ checked Sep 20, 2026	11-50	7 contacts →
	Partial evidence “The Quality Scheme for Ready Mixed Concrete (QSRMC) was established in 1984 to provide a specialised and dedicated certification service in respect of the design, production and…” Source: RevenueBase Database · checked Sep 20, 2026
22	Indelible Data Limited	Partial evidence	Maryport, United KingdomHQ checked Sep 20, 2026	1-10	6 contacts →
	Partial evidence “An accredited Cyber Essentials and Cyber Essentials Plus certification body, guiding organisations through a clear, effective certification process that strengthens security and…” Source: RevenueBase Database · checked Sep 20, 2026
23	QAI UK	Strong evidence	Nottingham, United KingdomHQ checked Sep 20, 2026	11-50	5 contacts →
	Strong evidence “Founded in 2011, Qualifications and Assessments International (QAI) is a UK-based provider of assessments, professional programmes, and certifications.” Source: RevenueBase Database · checked Sep 20, 2026
24	Advanced Certification Limited	Partial evidence	Portishead, United KingdomHQ checked Sep 20, 2026	11-50	5 contacts →
	Partial evidence “Advanced Certification was acquired by Amtivo Group and integrated into its largest UK brand, British Assessment Bureau.” Source: RevenueBase Database · checked Sep 20, 2026
25	ALL Plant Training	Indirect evidence	Wimborne, United KingdomHQ checked Sep 20, 2026	1-10	4 contacts →
	Indirect evidence “Training for a Safer Workplace” Source: RevenueBase Database · checked Sep 20, 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: professional certification 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 professional certification companies.
Partial evidence: Its own public description names part of professional certification companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name professional certification 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 117 professional certification companies based in the United Kingdom

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Professional certification companies based in the United Kingdom at a glance

As of Sep 20, 2026

30.4%Verified-email coverage

18.4Average contacts per company

11-50Median size (employees)

37.6%Largest-city concentration · London

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

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 117 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 professional certification 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 “professional certification 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 professional certification 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 professional certification 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, 655 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 20, 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.

Professional certification companies by metro

Professional certification companies in London44

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 professional certification 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 professional certification companies are there based in the United Kingdom?

RevenueBase identified 117 professional certification 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?

Nebosh, headquartered in Leicester, tops this list with the largest team on record.

Which city has the most professional certification companies?

London leads with 44 headquartered companies, followed by High Wycombe (3) and Croydon (2).

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 655 verified decision-maker contacts tracked across these 117 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 20, 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.