Company lists · Data refreshed September 2026

Top 17 Internal audit outsourcing firms based in the United Kingdom

Name: Internal audit outsourcing firms 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 49 companies tracked

RevenueBase identified 49 company matches for internal audit outsourcing firms associated with the United Kingdom as of September 2026 and tracks 708 professional contacts across them, including 323 with verified work emails. London is the largest hub.

This list covers company matches for internal audit outsourcing firms associated with the United Kingdom, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed September 28, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 RevenueBase SmartSearch · Exact Recorded Sep 28, 2026 How this list was built

49Companies

708Contacts tracked

323Verified emails

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The 17 largest internal audit outsourcing firms based in the United Kingdom

Ranked by team size

Top 17 of 49 company matches for internal audit outsourcing firms based in the United Kingdom, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 28, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	GI Outsourcing	Exact match	London, United KingdomHQ recorded Sep 28, 2026	201-500	311 contacts →
	Exact match “GI Outsourcing is a UK-based accountants outsourcing firm.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
2	Tiaa LTD	Exact match	Fareham, United KingdomHQ recorded Sep 28, 2026	51-200	117 contacts →
	Exact match “Relax.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
3	Auditone UK	Exact match	Durham, United KingdomHQ recorded Sep 28, 2026	51-200	26 contacts →
	Exact match “Providing internal audit, technology risk assurance and counter fraud services in the North of England.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
4	Independent Audit Limited	Exact match	London, United KingdomHQ recorded Sep 28, 2026	11-50	23 contacts →
	Exact match “Independent Audit are leading specialists in governance, risk and assurance.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
5	Bridgehouse	Exact match	Blackfriars, United KingdomHQ recorded Sep 28, 2026	11-50	19 contacts →
	Exact match “At Bridgehouse, we redefine governance, risk, compliance, and company secretarial services with flexible, cost-effective, and award-winning solutions for both public and private…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
6	Validera	Exact match	Burntwood, United KingdomHQ recorded Sep 28, 2026	11-50	16 contacts →
	Exact match “Specialist internal audit, governance, risk and compliance services provider; helping our clients Improve, Comply and Optimise.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
7	Parker Russell UK	Exact match	City Of London, United KingdomHQ recorded Sep 28, 2026	201-500	13 contacts →
	Exact match “Parker Russell is a leading audit firm offering comprehensive services to medium to large corporations, specialising in FCA-regulated environments and stock exchange-listed…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
8	John Williams	Exact match	Reigate, United KingdomHQ recorded Sep 28, 2026	11-50	13 contacts →
	Exact match “We are registered auditors and have a wide experience in reporting under the Companies Act and the special rules which govern solicitors.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
9	Just Audit	Exact match	Nottingham, United KingdomHQ recorded Sep 28, 2026	11-50	10 contacts →
	Exact match “When you work with us, you can expect a no-fuss, reliable audit.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
10	Byrd Link	Exact match	Cheltenham, United KingdomHQ recorded Sep 28, 2026	1-10	7 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
11	Littlechild & Haley	Exact match	Cardiff, United KingdomHQ recorded Sep 28, 2026	1-10	3 contacts →
	Exact match “We help organisations manage risks to success.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
12	Apex Business Compliance LTD	Exact match	Surrey, United KingdomHQ recorded Sep 28, 2026	1-10	3 contacts →
	Exact match “At Apex Business Compliance Ltd, we make compliance as easy as ABC.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
13	Bickham Montgomery	Exact match	London, United KingdomHQ recorded Sep 28, 2026	1-10	3 contacts →
	Exact match “We are an Internal Audit search firm operating within the Financial Services sector.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
14	Elsiarc Limited	Exact match	Alderholt, United KingdomHQ recorded Sep 28, 2026	1-10	2 contacts →
	Exact match “Established in 2021, Elsiarc was created to develop a more personal approach to internal audit, regulatory compliance and risk management.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
15	Rochester & Associates	Exact match	Bradford, United KingdomHQ recorded Sep 28, 2026	1-10	1 contacts →
	Exact match “Businesses rely on their computers for all their activities from marketing/sales, to delivery and finance.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
16	KLA Consulting LTD	Exact match	London, United KingdomHQ recorded Sep 28, 2026	1-10	1 contacts →
	Exact match “KLA provides Governance, Risk, Compliance, ESG, Internal Audit, Business Process Improvement and Transformational Change services to large and small clients.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
17	Practice Compliance Services Limited	Exact match	Falkirk, United KingdomHQ recorded Sep 28, 2026	1-10	1 contacts →
	Exact match “We can help minimise the compliance burden on audit registered firms by carrying out the Audit Compliance Review function.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “internal audit outsourcing firms”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 17 of 49 internal audit outsourcing firms based in the United Kingdom

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Internal audit outsourcing firms based in the United Kingdom at a glance

As of Sep 28, 2026

45.6%Verified-email coverage

14.4Average contacts per company

1-10Median size (employees)

42.9%Largest-city concentration · London

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

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 49 companies.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies: Company records associated with the United Kingdom whose business descriptions match “internal audit outsourcing firms” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 323 professional contacts with verified work emails across the full matched dataset. 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.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “internal audit outsourcing firms”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many internal audit outsourcing firms are there based in the United Kingdom?

RevenueBase identified 49 company matches for internal audit outsourcing firms associated with the United Kingdom as of September 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

GI Outsourcing tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city has the most internal audit outsourcing firms?

London leads with 21 company records, followed by Blackpool (2) and Alderholt (1).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 323 professional contacts with verified work emails tracked across these 49 companies; direct dials are available where recorded.

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 SmartSearch, 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.