Company lists · Data refreshed September 2026

Top 25 Iso 27001 audit consultants based in London, United Kingdom

Name: Iso 27001 audit consultants based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 69 companies tracked

RevenueBase identified 69 iso 27001 audit consultants headquartered in London, United Kingdom as of September 2026 and tracks 656 professional contacts across them, including 95 with verified work emails. Across the United Kingdom, London is the largest hub for this category.

This list covers iso 27001 audit consultants headquartered in London, 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

69Companies

656Contacts tracked

95Verified emails

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The 25 largest iso 27001 audit consultants based in London, United Kingdom

Ranked by team size

Top 25 of 69 iso 27001 audit consultants based in London, 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	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
3	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
4	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
5	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
6	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
7	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
8	Locked Stack	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	8 contacts →
	Partial evidence “Locked Stack is an independent cybersecurity consultancy and managed services firm headquartered in London, with a US subsidiary, operating across North America, Europe, and the…” Source: RevenueBase Database · checked Sep 28, 2026
9	Cortida	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	7 contacts →
	Partial evidence “Through excellent consultancy we protect clients from reputation damage, financial penalties and the operational disruption associated with data incidents and cyberattacks.” Source: RevenueBase Database · checked Sep 28, 2026
10	Cybersrc Consultancy LTD	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	7 contacts →
	Indirect evidence “CyberSRC specialises in 1LoD & 2LoD Operational & IT Risk, Security and Control Management & Transformation through developing, implementing, auditing, risk assessing and managing…” Source: RevenueBase Database · checked Sep 28, 2026
11	Abac Center Of Excellence Limited	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	6 contacts →
	Indirect evidence “ABAC® educates, equips and supports the world’s leading business organisations with the latest best-in-practice risk assessments, performance assessments, systems improvement and…” Source: RevenueBase Database · checked Sep 28, 2026
12	Meta Defence Labs LTD	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	5 contacts →
	Indirect evidence “As a distinguished UK National Cyber Security Center (NCSC) Assured Services Provider and an authorised certification body for esteemed credentials such as Cyber Essentials, Cyber…” Source: RevenueBase Database · checked Sep 28, 2026
13	High Table	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	5 contacts →
	Strong evidence “Helping you get ISO 27001 Certified.” Source: RevenueBase Database · checked Sep 28, 2026
14	Inavate Consulting LTD	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	3 contacts →
	Strong evidence “Inavate Consulting are experts in information security management and ISO 27001 implementation, helping organisations move beyond checkbox compliance to build robust…” Source: RevenueBase Database · checked Sep 28, 2026
15	Metis Security LTD	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	3 contacts →
	Partial evidence “Metis Security is an independent UK cybersecurity consultancy specialising in Microsoft cloud security control effectiveness.” Source: RevenueBase Database · checked Sep 28, 2026
16	Kiowa Security	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	3 contacts →
	Indirect evidence “Efficient, effective implementation of information security.” Source: RevenueBase Database · checked Sep 28, 2026
17	AKRUP	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	3 contacts →
	Indirect evidence “The leader in Cybersecurity compliance.” Source: RevenueBase Database · checked Sep 28, 2026
18	JSC Consultant Solutions LTD	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	2 contacts →
	Partial evidence “JSC Consultant Solutions Ltd was founded by Henrik Schouboe in 2012.” Source: RevenueBase Database · checked Sep 28, 2026
19	Netforte Consulting LTD	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	2 contacts →
	Strong evidence “Providing services such as: ISO 9001 Implementation ISO 27001 Implementation ISO 42001 Implementation Cyber Security Audits Penetration Testing Cloud Security VCISO Services SOC 2…” Source: RevenueBase Database · checked Sep 28, 2026
20	Metaluxo Information Security	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	2 contacts →
	Partial evidence “Metaluxo Information Security is a small security consultancy providing services of virtual / interim CISO (Chief Information Security Officer) as well as executive security…” Source: RevenueBase Database · checked Sep 28, 2026
21	Inovra Group	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	2 contacts →
	Strong evidence “Inovra specialises in the provision of management consultancy to SME businesses, with particular focus on consultancy and training for certification to ISO standards, including…” Source: RevenueBase Database · checked Sep 28, 2026
22	Secom Consulting	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	2 contacts →
	Partial evidence “Secom Consulting is a leading specialist in management systems consultancy, helping a wide range of private and public sector clients to implement and maintain highly functional…” Source: RevenueBase Database · checked Sep 28, 2026
23	Blackbox Tech Limited	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	2 contacts →
	Partial evidence “BlackBox Technologies provide IT consultancy services to the SME sector ranging from Auditing, Cloud Evaluation Assessment, High level project design implementation and strategic…” Source: RevenueBase Database · checked Sep 28, 2026
24	Velocity Check	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	2 contacts →
	Partial evidence “Check our compliance, ISO certification and cyber security services.” Source: RevenueBase Database · checked Sep 28, 2026
25	Onion Security LTD	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	1 contacts →
	Partial evidence “Onion Security Ltd is a London-based information security consultancy with 20 years of experience in cybersecurity for financial services.” 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 69 iso 27001 audit consultants based in London, United Kingdom

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Iso 27001 audit consultants based in London, United Kingdom at a glance

As of Sep 28, 2026

14.5%Verified-email coverage

9.5Average contacts per company

1-10Median size (employees)

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

Email recency for this list is measured across the whole United Kingdom list rather than for London, so it is reported there. Company counts and contact totals on this page are exact for London, over 69 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 London, 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 London 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, 95 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.

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 London, United Kingdom?

RevenueBase identified 69 iso 27001 audit consultants headquartered in London, 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 in the United Kingdom has the most iso 27001 audit consultants?

London leads the United Kingdom 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 95 verified decision-maker contacts tracked across these 69 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.