Company lists · Data refreshed September 2026

Top 25 Iso 27001 audit consultants based in the United Kingdom

Name: Iso 27001 audit consultants 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 420 companies tracked

RevenueBase identified 420 iso 27001 audit consultants headquartered in the United Kingdom as of September 2026 and tracks 2,854 professional contacts across them, including 1,100 with verified work emails. London is the largest hub.

This list covers iso 27001 audit consultants 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

420Companies

2,854Contacts tracked

1,100Verified emails

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The 25 largest iso 27001 audit consultants based in the United Kingdom

Ranked by team size

Top 25 of 420 iso 27001 audit consultants 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 27001 audit consultants: 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	operum.tech	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	n/a	186 contacts →
	Indirect evidence “IT support for businesses in London.” Source: RevenueBase Database · checked Sep 28, 2026
2	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
3	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
4	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
5	URM	Partial evidence	Reading, United KingdomHQ checked Sep 28, 2026	51-200	81 contacts →
	Partial evidence “Established in 2005, URM Consulting is a specialist provider of cyber and information security consultancy, training, and assurance services.” Source: RevenueBase Database · checked Sep 28, 2026
6	isms.online	Indirect evidence	Brighton, United KingdomHQ checked Sep 28, 2026	51-200	70 contacts →
	Indirect evidence “ISMS.online helps thousands of companies around the world with their information security, data privacy and other compliance needs.” Source: RevenueBase Database · checked Sep 28, 2026
7	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
8	ISO Quality Services LTD ISO QSL	Strong evidence	Worcester, United KingdomHQ checked Sep 28, 2026	11-50	37 contacts →
	Strong 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
9	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
10	Clear Quality Limited	Strong evidence	Rotherham, United KingdomHQ checked Sep 28, 2026	11-50	28 contacts →
	Strong evidence “Clear Quality is a professional ISO Consultancy business and Prime Training provider based in South Yorkshire.” Source: RevenueBase Database · checked Sep 28, 2026
11	Harptec LTD	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	22 contacts →
	Partial evidence “We are a Cyber and Compliance focused Engineering company helping companies to achieve ISO standards and supporting the implementation of these standards through cutting-edge…” Source: RevenueBase Database · checked Sep 28, 2026
12	Advent IM	Partial evidence	Halesowen, United KingdomHQ checked Sep 28, 2026	11-50	21 contacts →
	Partial evidence “Advent IM is the UK’s leading independent GRC information and physical security consultancy and training provider.” Source: RevenueBase Database · checked Sep 28, 2026
13	TPT Consultancy & Training LTD	Partial evidence	Merthyr Tydfil, United KingdomHQ checked Sep 28, 2026	1-10	21 contacts →
	Partial evidence “TPT is a leading provider of training and consultancy, serving customers around the world.” Source: RevenueBase Database · checked Sep 28, 2026
14	Rightcue	Indirect evidence	Basingstoke, United KingdomHQ checked Sep 28, 2026	11-50	20 contacts →
	Indirect evidence “We help organisations achieve business-focused cybersecurity compliance across various industry and regulatory frameworks with successful stakeholder management, particularly in…” Source: RevenueBase Database · checked Sep 28, 2026
15	Consultants Factory	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	20 contacts →
	Indirect evidence “We at CF assist enterprises manage IT risks better.” Source: RevenueBase Database · checked Sep 28, 2026
16	Bemcon	Partial evidence	Manchester, United KingdomHQ checked Sep 28, 2026	51-200	19 contacts →
	Partial evidence “Business Excellence & Management Consortium (BEMCON) is a professional training, consulting, and auditing organization specializing in ISO standards, occupational health & safety…” Source: RevenueBase Database · checked Sep 28, 2026
17	CQS Certified Quality Systems Limited	Partial evidence	Malvern, United KingdomHQ checked Sep 28, 2026	11-50	18 contacts →
	Partial evidence “CQS (Certified Quality Systems) Ltd delivers straightforward, practical ISO certification with over 25 years of experience.” Source: RevenueBase Database · checked Sep 28, 2026
18	CFE Certification	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	18 contacts →
	Indirect evidence “We provide a wide range of auditing, certification and gap analysis services on; AI, DORA, NIS2, Information Security, Business Continuity, International IT Service, GDPR and…” Source: RevenueBase Database · checked Sep 28, 2026
19	Aviso Consultancy LTD	Partial evidence	Southwark, United KingdomHQ checked Sep 28, 2026	11-50	17 contacts →
	Partial evidence “AvISO Consultancy helps organisations build management systems that genuinely work in practice.” Source: RevenueBase Database · checked Sep 28, 2026
20	Blackmores UK LTD	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	17 contacts →
	Partial evidence “ISO Standards can help you improve efficiency, reduce costs and increase tender opportunities.” Source: RevenueBase Database · checked Sep 28, 2026
21	Risk Crew	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	14 contacts →
	Indirect evidence “Risk Crew is known for their vision, innovative thinking and facility to embrace change.” Source: RevenueBase Database · checked Sep 28, 2026
22	Quadra LTD	Strong evidence	Holywood, United KingdomHQ checked Sep 28, 2026	11-50	13 contacts →
	Strong evidence “Quadra is a management systems consultancy and training organisation specialising in implementing management systems to international standards to include: Quality (ISO…” Source: RevenueBase Database · checked Sep 28, 2026
23	Candy Management Consultants	Strong evidence	Stockport, United KingdomHQ checked Sep 28, 2026	1-10	13 contacts →
	Strong evidence “Candy Management Consultants has been aiding companies in attaining ISO Certification and ensuring Health and Safety compliance since 2017.” Source: RevenueBase Database · checked Sep 28, 2026
24	QCS International	Partial evidence	Cumbernauld, United KingdomHQ checked Sep 28, 2026	1-10	12 contacts →
	Partial evidence “QCS International are experts in ISO certification from management system implementation to auditor training.” Source: RevenueBase Database · checked Sep 28, 2026
25	NDC Certification Bureau LTD	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	12 contacts →
	Partial evidence “NDC started 15 years ago as a consultancy firm; specialising in manufacturing, service and aerospace sectors.” 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 27001 audit consultants. 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 27001 audit consultants.
Partial evidence: Its own public description names part of iso 27001 audit consultants, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name iso 27001 audit consultants. 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 420 iso 27001 audit consultants based in the United Kingdom

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Iso 27001 audit consultants based in the United Kingdom at a glance

As of Sep 28, 2026

38.5%Verified-email coverage

6.8Average contacts per company

1-10Median size (employees)

16.4%Largest-city concentration · London

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

335

11-50

51-200

201-500

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 420 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 27001 audit consultants, 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 27001 audit consultants”. 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 27001 audit consultants), 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 27001 audit consultants, 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, 1,100 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 27001 audit consultants by metro

Iso 27001 audit consultants in London69

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 27001 audit consultants, 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 27001 audit consultants are there based in the United Kingdom?

RevenueBase identified 420 iso 27001 audit consultants 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?

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

Which city has the most iso 27001 audit consultants?

London leads with 69 headquartered companies, followed by Manchester (11) and Birmingham (8).

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 1,100 verified decision-maker contacts tracked across these 420 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.