Company lists · Data refreshed September 2026

Top 25 IT audit consultancies based in the United Kingdom

Name: IT audit consultancies 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 159 companies tracked

RevenueBase identified 159 IT audit consultancies headquartered in the United Kingdom as of September 2026 and tracks 1,601 professional contacts across them, including 232 with verified work emails. London is the largest hub.

This list covers IT audit consultancies 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

159Companies

1,601Contacts tracked

232Verified emails

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The 25 largest IT audit consultancies based in the United Kingdom

Ranked by team size

Top 25 of 159 IT audit consultancies 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 IT audit consultancies: 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	Omnicyber Security	Partial evidence	Solihull, United KingdomHQ checked Sep 28, 2026	11-50	31 contacts →
	Partial evidence “SPECIALISTS IN IT SECURITY AND COMPLIANCE Our goal is to help customers define, develop and implement information security and compliance services, no matter what stage of the…” Source: RevenueBase Database · checked Sep 28, 2026
2	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
3	Auditone UK	Partial evidence	Durham, United KingdomHQ checked Sep 28, 2026	51-200	26 contacts →
	Partial evidence “Providing internal audit, technology risk assurance and counter fraud services in the North of England.” Source: RevenueBase Database · checked Sep 28, 2026
4	Independent Audit Limited	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	23 contacts →
	Partial evidence “Independent Audit are leading specialists in governance, risk and assurance.” Source: RevenueBase Database · checked Sep 28, 2026
5	Consultants Factory	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	20 contacts →
	Partial evidence “We at CF assist enterprises manage IT risks better.” Source: RevenueBase Database · checked Sep 28, 2026
6	Mirador Solutions Consultancy	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	17 contacts →
	Indirect evidence “Trusted Partner to the Financial Services From the business, to your business Mirador Solutions Consultancy is a trusted and strategic partner for financial services firms, with…” Source: RevenueBase Database · checked Sep 28, 2026
7	Recsel International	Partial evidence	Victoria, United KingdomHQ checked Sep 28, 2026	1-10	17 contacts →
	Partial evidence “RecSel International is the specialist recruitment consultancy for audit jobs across Europe.” Source: RevenueBase Database · checked Sep 28, 2026
8	Validera	Partial evidence	Burntwood, United KingdomHQ checked Sep 28, 2026	11-50	16 contacts →
	Partial evidence “Specialist internal audit, governance, risk and compliance services provider; helping our clients Improve, Comply and Optimise.” Source: RevenueBase Database · checked Sep 28, 2026
9	Hanami International	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	16 contacts →
	Partial evidence “International recruitment specialists in Internal Audit & Professional Services Hanami International is an Internal Audit & Professional Services (including External Audit…” Source: RevenueBase Database · checked Sep 28, 2026
10	Parker Russell UK	Partial evidence	City Of London, United KingdomHQ checked Sep 28, 2026	201-500	13 contacts →
	Partial evidence “Parker Russell is a leading audit firm offering comprehensive services to medium to large corporations, specialising in FCA-regulated environments and stock exchange-listed…” Source: RevenueBase Database · checked Sep 28, 2026
11	Octa Accountants	Indirect evidence	Essex, United KingdomHQ checked Sep 28, 2026	1-10	13 contacts →
	Indirect evidence “OCTA Accountants is one of the emerging accounting and consulting firms across the globe.” Source: RevenueBase Database · checked Sep 28, 2026
12	John Williams	Indirect evidence	Reigate, United KingdomHQ checked Sep 28, 2026	11-50	13 contacts →
	Indirect evidence “We are registered auditors and have a wide experience in reporting under the Companies Act and the special rules which govern solicitors.” Source: RevenueBase Database · checked Sep 28, 2026
13	Cyber Guarded LTD	Indirect evidence	Belfast, United KingdomHQ checked Sep 28, 2026	11-50	12 contacts →
	Indirect evidence “Cyber Guarded is a vendor independent business which provides Cyber Security auditing and testing services.” Source: RevenueBase Database · checked Sep 28, 2026
14	Zenith Audit UK LTD	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	11 contacts →
	Partial evidence “Zenith Audit UK is a specialist audit firm delivering assurance and risk management services to SMEs in the financial services industry and beyond.” Source: RevenueBase Database · checked Sep 28, 2026
15	Just Audit	Partial evidence	Nottingham, United KingdomHQ checked Sep 28, 2026	11-50	10 contacts →
	Partial evidence “When you work with us, you can expect a no-fuss, reliable audit.” Source: RevenueBase Database · checked Sep 28, 2026
16	Corporate IT Systems Limited	Partial evidence	Poole, United KingdomHQ checked Sep 28, 2026	11-50	9 contacts →
	Partial evidence “Corporate IT Systems (CITSL) helps the organisations society depends on most make trust provable.” Source: RevenueBase Database · checked Sep 28, 2026
17	Cube Partners Limited	Indirect evidence	Northampton, United KingdomHQ checked Sep 28, 2026	11-50	9 contacts →
	Indirect evidence “Cube Partners Limited is a firm of Chartered Accountants and Registered Auditors, regulated by the Institute of Chartered Accountants in England & Wales.” Source: RevenueBase Database · checked Sep 28, 2026
18	Slade & Cooper	Indirect evidence	Manchester, United KingdomHQ checked Sep 28, 2026	1-10	9 contacts →
	Indirect evidence “We are a Manchester-based firm of accountants and auditors working with charities, social enterprises and co-operatives.” Source: RevenueBase Database · checked Sep 28, 2026
19	Xcina Consulting	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	9 contacts →
	Indirect evidence “At Xcina Consulting we leverage a deep and experienced pool of skilled consultants to deliver all our assurance and advisory services.” Source: RevenueBase Database · checked Sep 28, 2026
20	Exsus Audit	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	9 contacts →
	Indirect evidence “EXSUS AUDITis offering a comprehensive range of accounting, auditing, tax planning and business consulting services to Cypriot and offshore companies and high net worth…” Source: RevenueBase Database · checked Sep 28, 2026
21	Mcmillan Woods Audits Limited	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	8 contacts →
	Partial evidence “We are your trusted partners in the world of audit and assurance.” Source: RevenueBase Database · checked Sep 28, 2026
22	Cortida	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	7 contacts →
	Indirect 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
23	Cybersrc Consultancy LTD	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	7 contacts →
	Partial 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
24	Byrd Link	Indirect evidence	Cheltenham, United KingdomHQ checked Sep 28, 2026	1-10	7 contacts →
	Indirect evidence “Founded on the belief that auditing can be positive and stress-free, Byrd + Link specialise in partnering with leading regional Accountancy Practices, and supporting commercial…” Source: RevenueBase Database · checked Sep 28, 2026
25	Altus Enterprises LTD	Partial evidence	Glasgow City, United KingdomHQ checked Sep 28, 2026	1-10	7 contacts →
	Partial evidence “Independent Audit, Niche Consultancy, Efficiency Reviews, Procurement and Business Intelligence across the print, postal and courier categories.” 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: IT audit consultancies. 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 IT audit consultancies.
Partial evidence: Its own public description names part of IT audit consultancies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name IT audit consultancies. 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 159 IT audit consultancies based in the United Kingdom

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IT audit consultancies based in the United Kingdom at a glance

As of Sep 28, 2026

14.5%Verified-email coverage

10.1Average contacts per company

1-10Median size (employees)

40.3%Largest-city concentration · London

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

110

11-50

51-200

201-500

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 159 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 IT audit consultancies, 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 “IT audit consultancies”. 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 IT audit consultancies), 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 IT audit consultancies, 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, 232 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.

IT audit consultancies by metro

IT audit consultancies in London64

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 IT audit consultancies, 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 IT audit consultancies are there based in the United Kingdom?

RevenueBase identified 159 IT audit consultancies 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?

Omnicyber Security, headquartered in Solihull, tops this list with the largest team on record.

Which city has the most IT audit consultancies?

London leads with 64 headquartered companies, followed by Belfast (3) and Cheltenham (3).

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 232 verified decision-maker contacts tracked across these 159 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.