Company lists · Data refreshed September 2026

Top 25 Due diligence consulting firms based in the United Kingdom

Name: Due diligence consulting 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 1, 2026 66 companies tracked

RevenueBase identified 66 due diligence consulting firms headquartered in the United Kingdom as of September 2026 and tracks 569 professional contacts across them, including 277 with verified work emails and 83 with mobile numbers. London is the largest hub.

This list covers due diligence consulting firms 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 1, 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 RevenueBase Smart Search rating on every row Refreshed Sep 1, 2026 86% judged on-target in blind review

66Companies

569Contacts tracked

277Verified emails

83Mobile numbers

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The 25 largest due diligence consulting firms based in the United Kingdom

Ranked by team size

Top 25 of 66 due diligence consulting firms based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 1, 2026. RevenueBase Smart Search rates how each company's information relates to due diligence consulting firms: 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	Neotas	Strong evidence	London, United Kingdom	51-200	157 contacts →
	Strong evidence “By leveraging cutting-edge technology and experienced analysts, Neotas are going beyond and setting new standards in Due Diligence, Staff Screening, and Compliance.” Source: RevenueBase Database · checked Sep 1, 2026
2	Palladium Digital	Strong evidence	London, United Kingdom	51-200	48 contacts →
	Strong evidence “We empower private equity firms to make sound investment decisions with our award-winning digital due diligence, whilst supporting portfolio companies through necessary digital…” Source: RevenueBase Database · checked Sep 1, 2026
3	GRS An Nv5 Company	Strong evidence	London, United Kingdom	1,001-5,000	47 contacts →
	Strong evidence “On the leading edge of innovation in commercial real estate transactions, GRS an NV5 Company is one of the largest national provider CRE due diligence services.” Source: RevenueBase Database · checked Sep 1, 2026
4	Ringstone	Indirect evidence	London, United Kingdom	51-200	31 contacts →
	Indirect evidence “RingStone works with investors, software, and tech-enabled companies to add value to their businesses and investments.” Source: RevenueBase Database · checked Sep 1, 2026
5	Connell Consulting	Strong evidence	London, United Kingdom	11-50	24 contacts →
	Strong evidence “Connell Consulting has a reputation for carrying out reliable and well-researched commercial due diligence, strategic and operational improvement projects, delivered by a…” Source: RevenueBase Database · checked Sep 1, 2026
6	Ground Truth Intelligence	Strong evidence	London, United Kingdom	11-50	23 contacts →
	Strong evidence “Ground Truth Intelligence is the global due diligence platform designed for an ever-changing world.” Source: RevenueBase Database · checked Sep 1, 2026
7	Hartford Advisers	Strong evidence	London, United Kingdom	11-50	15 contacts →
	Strong evidence “Hartford Advisers is a specialist intelligence, research and due diligence firm.” Source: RevenueBase Database · checked Sep 1, 2026
8	Kent Finance	Indirect evidence	Pluckley, United Kingdom	11-50	15 contacts →
	Indirect evidence “Delivering financial clarity and confidence to decision-makers!” Source: RevenueBase Database · checked Sep 1, 2026
9	Fulcrum Diligence LTD	Strong evidence	London, United Kingdom	11-50	11 contacts →
	Strong evidence “Due Diligence as it should be.” Source: RevenueBase Database · checked Sep 1, 2026
10	Confidas	Indirect evidence	Europe, United Kingdom	11-50	11 contacts →
	Indirect evidence “Confidas People - People Assessment for investment.” Source: RevenueBase Database · checked Sep 1, 2026
11	Luminii Consulting	Partial evidence	Manchester, United Kingdom	11-50	9 contacts →
	Partial evidence “Luminii Consulting is an award-winning consultancy recognised as the CDD Provider of the Year at the 2023 Real Deals Private Equity Awards.” Source: RevenueBase Database · checked Sep 1, 2026
12	Gmtl Advisory	Strong evidence	London, United Kingdom	11-50	9 contacts →
	Strong evidence “Strategic intelligence and high end due diligence provider to global corporations and investors.” Source: RevenueBase Database · checked Sep 1, 2026
13	Osterwald Rathbone & Partners	Partial evidence	London, United Kingdom	1-10	8 contacts →
	Partial evidence “Osterwald Rathbone & Partners focuses on providing industry-led professional consulting advice to corporate entities & their legal representatives in a variety of situations…” Source: RevenueBase Database · checked Sep 1, 2026
14	DNS Corporate Advisory	Indirect evidence	London, United Kingdom	1-10	7 contacts →
	Indirect evidence “We advise UK owner-managed businesses on buying, selling, valuing and funding companies in the £500k to £10m deal range.” Source: RevenueBase Database · checked Sep 1, 2026
15	Ardra Partners	Indirect evidence	London, United Kingdom	1-10	5 contacts →
	Indirect evidence “Ardra Partners is a specialist consultant that provides services to a selected group of clients in a range of high growth subsectors.” Source: RevenueBase Database · checked Sep 1, 2026
16	DE Vere Intellica	Indirect evidence	London, United Kingdom	11-50	4 contacts →
	Indirect evidence “De Vere Intellica has provided a wide range of services to the Financial Services, Legal, Insolvency, Corporate and Not-for Profit sectors since the early 1990s.” Source: RevenueBase Database · checked Sep 1, 2026
17	IDA Business Consulting LTD	Partial evidence	London, United Kingdom	1-10	4 contacts →
	Partial evidence “Ida Business Consulting was founded by Murat Barin who is a dual qualified accountant in Turkey and England.” Source: RevenueBase Database · checked Sep 1, 2026
18	Tech Stack Authority	Strong evidence	London, United Kingdom	1-10	4 contacts →
	Strong evidence “Tech Stack Authority is a leader in technical assessment and due diligence, providing fast, high-quality and cost-efficient tech diagnostics to business leaders to help them drive…” Source: RevenueBase Database · checked Sep 1, 2026
19	Mint Analysis	Indirect evidence	London, United Kingdom	1-10	4 contacts →
	Indirect evidence “Protect your brand & culture with M.INT.” Source: RevenueBase Database · checked Sep 1, 2026
20	CAENA	Indirect evidence	London, United Kingdom	1-10	3 contacts →
	Indirect evidence “We help private equity and venture capital funds optimise portfolio value.” Source: RevenueBase Database · checked Sep 1, 2026
21	Proponent Capital LTD	Partial evidence	London, United Kingdom	1-10	2 contacts →
	Partial evidence “Proponent Capital is a business that provides consulting services to sophisticated corporate investors to help them understand their opportunities to invest in transactions which…” Source: RevenueBase Database · checked Sep 1, 2026
22	4d DUE Diligence	Strong evidence	London, United Kingdom	11-50	2 contacts →
	Strong evidence “4D conducts due diligence services into technology, products, sales, and companies on behalf of our clients.” Source: RevenueBase Database · checked Sep 1, 2026
23	Burns & Turner LTD	Indirect evidence	Sunderland, United Kingdom	11-50	1 contacts →
	Indirect evidence “From conducting independent business evaluations, creating powerful data insight and analysis, managing data compliance risks, and developing your future strategy, everything we…” Source: RevenueBase Database · checked Sep 1, 2026
24	BARTY	Partial evidence	London, United Kingdom	1-10	1 contacts →
	Partial evidence “Guiding businesses and investors through the toughest technology choices, from diligence to delivery.” Source: RevenueBase Database · checked Sep 1, 2026
25	Clipper Consulting	Strong evidence	Old Basing, United Kingdom	1-10	1 contacts →
	Strong evidence “High Level Due Diligence \| Risk Advisory \| Problem Solving \| Non-Executive Director \| Executive Coaching Andy Wynn, Principal 35+ years experience, chair, CEO, director positions…” Source: RevenueBase Database · checked Sep 1, 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: due diligence consulting firms. 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 due diligence consulting firms.
Partial evidence: Its own public description names part of due diligence consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name due diligence consulting firms. 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 66 due diligence consulting firms based in the United Kingdom

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Due diligence consulting firms based in the United Kingdom at a glance

As of Sep 1, 2026

48.7%Verified-email coverage

14.6%Mobile-number coverage

8.6Average contacts per company

1-10Median size (employees)

69.7%Largest-city concentration · London

Sep 1, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

1,001-5,000

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 due diligence consulting firms, 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 “due diligence consulting firms”. 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 due diligence consulting firms), 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 due diligence consulting firms, 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, 277 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 1, 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.

Due diligence consulting firms by metro

Due diligence consulting firms in London46

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 due diligence consulting firms, 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 due diligence consulting firms are there based in the United Kingdom?

RevenueBase identified 66 due diligence consulting firms 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?

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

Which city has the most due diligence consulting firms?

London leads with 46 headquartered companies, followed by Bishops Stortford (1) and St Albans (1).

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 277 verified decision-maker contacts tracked across these 66 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 1, 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.