Company lists · Data refreshed September 2026

Top 25 IT advisory consulting firms based in London, United Kingdom

Name: IT advisory consulting firms based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 26, 2026 1,910 companies tracked

RevenueBase identified 1,910 IT advisory consulting firms headquartered in London, United Kingdom as of September 2026 and tracks 433,388 professional contacts across them, including 159,193 with verified work emails. Across the United Kingdom, London is the largest hub for this category.

This list covers IT advisory consulting firms 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 26, 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 26, 2026 86% judged on-target in blind review

1,910Companies

433,388Contacts tracked

159,193Verified emails

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The 25 largest IT advisory consulting firms based in London, United Kingdom

Ranked by team size

Top 25 of 1,910 IT advisory consulting firms based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 26, 2026. RevenueBase Smart Search rates how each company's information relates to IT advisory 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	EY	Indirect evidence	London, United KingdomHQ checked Sep 26, 2026	10001+	375,085 contacts →
	Indirect evidence “EY is building a better working world by creating new value for clients, people, society, the planet, while building trust in the capital markets.” Source: RevenueBase Database · checked Sep 26, 2026
2	Kpmg UK	Indirect evidence	London, United KingdomHQ checked Sep 26, 2026	10001+	14,509 contacts →
	Indirect evidence “Make growth happen.” Source: RevenueBase Database · checked Sep 26, 2026
3	Endava	Indirect evidence	London, United KingdomHQ checked Sep 26, 2026	10001+	9,653 contacts →
	Indirect evidence “For over two decades, we have been harnessing technology to drive meaningful change.” Source: RevenueBase Database · checked Sep 26, 2026
4	CAPCO	Indirect evidence	London, United KingdomHQ checked Sep 26, 2026	5,001-10,000	7,396 contacts →
	Indirect evidence “Capco, a Wipro company, is a global technology and management consultancy specializing in driving digital transformation in the financial services industry.” Source: RevenueBase Database · checked Sep 26, 2026
5	Noventiq	Indirect evidence	London, United KingdomHQ checked Sep 26, 2026	5,001-10,000	1,508 contacts →
	Indirect evidence “Noventiq (Noventiq Holdings PLC) is a leading global solutions and services provider in digital transformation and cybersecurity, headquartered in London.” Source: RevenueBase Database · checked Sep 26, 2026
6	Crowe UK	Strong evidence	London, United KingdomHQ checked Sep 26, 2026	1,001-5,000	1,395 contacts →
	Strong evidence “Crowe UK is a leading audit, tax, advisory and consulting firm with a national presence to complement our international reach.” Source: RevenueBase Database · checked Sep 26, 2026
7	Equal Experts	Indirect evidence	London, United KingdomHQ checked Sep 26, 2026	1,001-5,000	1,172 contacts →
	Indirect evidence “We are honoured to be recognised as one of the Top 10 Best Places to Work in the UK for the third year running, according to Glassdoor’s prestigious 2026 list.” Source: RevenueBase Database · checked Sep 26, 2026
8	Moore Kingston Smith	Indirect evidence	London, United KingdomHQ checked Sep 26, 2026	501-1,000	1,151 contacts →
	Indirect evidence “At Moore Kingston Smith, we believe in the potential of people to make a positive impact, fuelled by the power of genuine understanding.” Source: RevenueBase Database · checked Sep 26, 2026
9	PKF Littlejohn	Indirect evidence	London, United KingdomHQ checked Sep 26, 2026	501-1,000	702 contacts →
	Indirect evidence “We are a fast-growing firm of accountants and business advisers based in London’s Canary Wharf, Leeds and in Manchester.” Source: RevenueBase Database · checked Sep 26, 2026
10	VML Enterprise Solutions	Indirect evidence	London, United KingdomHQ checked Sep 26, 2026	5,001-10,000	697 contacts →
	Indirect evidence “Follow us now at WPP Enterprise Solutions, WPP’s global business transformation unit, designing, building and operating the growth systems that competitive businesses rely on.” Source: RevenueBase Database · checked Sep 26, 2026
11	Mazars In The UK	Indirect evidence	London, United KingdomHQ checked Sep 26, 2026	1,001-5,000	505 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 26, 2026
12	Zenitech	Indirect evidence	London, United KingdomHQ checked Sep 26, 2026	501-1,000	408 contacts →
	Indirect evidence “Zenitech creates technology to transform businesses.” Source: RevenueBase Database · checked Sep 26, 2026
13	KIN Carta	Indirect evidence	London, United KingdomHQ checked Sep 26, 2026	5,001-10,000	400 contacts →
	Indirect evidence “Kin + Carta was acquired by Valtech in 2024.” Source: RevenueBase Database · checked Sep 26, 2026
14	Sandhata Technologies	Indirect evidence	London, United KingdomHQ checked Sep 26, 2026	201-500	363 contacts →
	Indirect evidence “We are a global niche consultancy specialising in services that span all facets of Digital transformation, DevOps, and System Integration.” Source: RevenueBase Database · checked Sep 26, 2026
15	Cartesian	Partial evidence	London, United KingdomHQ checked Sep 26, 2026	201-500	302 contacts →
	Partial evidence “Cartesian is a specialist consulting firm focused on the global telecommunications, media, and technology industries and is now part of Bounteous, an AI services firm helping…” Source: RevenueBase Database · checked Sep 26, 2026
16	KOCHO	Indirect evidence	London, United KingdomHQ checked Sep 26, 2026	201-500	295 contacts →
	Indirect evidence “At Kocho, we believe greatness lies in everyone.” Source: RevenueBase Database · checked Sep 26, 2026
17	Devtech	Indirect evidence	London, United KingdomHQ checked Sep 26, 2026	201-500	266 contacts →
	Indirect evidence “Devtech provides outcome-driven digital innovation services and helps companies better respond to change.” Source: RevenueBase Database · checked Sep 26, 2026
18	Cloudreach, An Eviden Business	Indirect evidence	London, United KingdomHQ checked Sep 26, 2026	501-1,000	261 contacts →
	Indirect evidence “As of April 2023, Cloudreach is now part of Eviden, an atos business.” Source: RevenueBase Database · checked Sep 26, 2026
19	The Adaptavist Group	Indirect evidence	London, United KingdomHQ checked Sep 26, 2026	1,001-5,000	254 contacts →
	Indirect evidence “We are experts at delivering innovative software, tailored solutions, and quality services across some of the world's most trusted technology ecosystems, including Atlassian, AWS…” Source: RevenueBase Database · checked Sep 26, 2026
20	Percipere	Indirect evidence	London, United KingdomHQ checked Sep 26, 2026	201-500	245 contacts →
	Indirect evidence “Percipere is a niche global consultancy, partnering companies in their evolution towards greater operational efficiency and profitability.” Source: RevenueBase Database · checked Sep 26, 2026
21	Flat Rock Technology	Indirect evidence	London, United KingdomHQ checked Sep 26, 2026	201-500	231 contacts →
	Indirect evidence “Since 2008, Flat Rock Technology, a software engineering, SI, Cloud DevOps, Cyber Security, and Customer Experience (CX) company, has been at the forefront of providing innovative…” Source: RevenueBase Database · checked Sep 26, 2026
22	Tmotions Global Limited	Indirect evidence	London, United KingdomHQ checked Sep 26, 2026	201-500	228 contacts →
	Indirect evidence “TMotions is inspired by forward-thinking businesses, who are now looking past recovery and shifting into the growth mode.” Source: RevenueBase Database · checked Sep 26, 2026
23	Natilik	Indirect evidence	London, United KingdomHQ checked Sep 26, 2026	201-500	222 contacts →
	Indirect evidence “Natilik is your technology solutions partner and confident guide to digital transformation, specialising in a range of solutions to help you achieve your goals and drive real…” Source: RevenueBase Database · checked Sep 26, 2026
24	Retail Reply	Indirect evidence	London, United KingdomHQ checked Sep 26, 2026	51-200	214 contacts →
	Indirect evidence “Retail Reply helps clients accelerate their response to the opportunities of digital transformation in the retail and consumer sector.” Source: RevenueBase Database · checked Sep 26, 2026
25	Lubbock Fine	Partial evidence	London, United KingdomHQ checked Sep 26, 2026	51-200	203 contacts →
	Partial evidence “Lubbock Fine is an independent accounting, tax, audit and advisory firm in the City of London.” Source: RevenueBase Database · checked Sep 26, 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 advisory 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 IT advisory consulting firms.
Partial evidence: Its own public description names part of IT advisory consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name IT advisory 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 1,910 IT advisory consulting firms based in London, United Kingdom

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IT advisory consulting firms based in London, United Kingdom at a glance

As of Sep 26, 2026

36.7%Verified-email coverage

226.9Average contacts per company

1-10Median size (employees)

Sep 26, 2026Page data refreshed

Companies by employee count

1-10

1,200

11-50

464

51-200

163

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

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 1,910 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 advisory 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 London, United Kingdom whose own description of what they do matches “IT advisory 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 IT advisory 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 IT advisory consulting firms, 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, 159,193 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 26, 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 advisory consulting firms by metro in the United Kingdom

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 advisory 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 IT advisory consulting firms are there based in London, United Kingdom?

RevenueBase identified 1,910 IT advisory consulting firms 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?

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

Which city in the United Kingdom has the most IT advisory consulting firms?

London leads the United Kingdom with 1,910 headquartered companies, followed by Manchester (109) and Bristol (59).

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 159,193 verified decision-maker contacts tracked across these 1,910 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 26, 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.