Company lists · Data refreshed September 2026

Top 25 Consulting IT services based in London, United Kingdom

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

Compiled by the RevenueBase Data Team Data refreshed Sep 24, 2026 2,681 companies tracked

RevenueBase identified 2,681 consulting IT services headquartered in London, United Kingdom as of September 2026 and tracks 53,852 professional contacts across them, including 15,009 with verified work emails. London is the largest hub.

This list covers consulting IT services 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 24, 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 24, 2026 86% judged on-target in blind review

2,681Companies

53,852Contacts tracked

15,009Verified emails

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The 25 largest consulting IT services based in London, United Kingdom

Ranked by team size

Top 25 of 2,681 consulting IT services based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 24, 2026. RevenueBase Smart Search rates how each company's information relates to consulting IT services: 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	Endava	Indirect evidence	London, United KingdomHQ checked Sep 24, 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 24, 2026
2	Nashtech	Indirect evidence	London, United KingdomHQ checked Sep 24, 2026	1,001-5,000	1,611 contacts →
	Indirect evidence “We are experts in technology, delivering smart solutions that solve business challenges and create value.” Source: RevenueBase Database · checked Sep 24, 2026
3	K2 Partnering Solutions	Indirect evidence	London, United KingdomHQ checked Sep 24, 2026	1,001-5,000	1,417 contacts →
	Indirect evidence “K2 Partnering Solutions is a global provider of unique end-to-end consultative solutions in the enterprise applications, AI, and cloud space.” Source: RevenueBase Database · checked Sep 24, 2026
4	NSC Global	Indirect evidence	London, United KingdomHQ checked Sep 24, 2026	1,001-5,000	1,039 contacts →
	Indirect evidence “Global business doesn’t have to be complicated.” Source: RevenueBase Database · checked Sep 24, 2026
5	Advania UK	Indirect evidence	London, United KingdomHQ checked Sep 24, 2026	1,001-5,000	910 contacts →
	Indirect evidence “We empower people to create sustainable value with the clever use of technology.” Source: RevenueBase Database · checked Sep 24, 2026
6	Alten LTD - UK	Partial evidence	London, United KingdomHQ checked Sep 24, 2026	10001+	529 contacts →
	Partial evidence “We are a leading Engineering and IT consultancy operating across all sectors in 30 different countries.” Source: RevenueBase Database · checked Sep 24, 2026
7	Zenzero	Partial evidence	London, United KingdomHQ checked Sep 24, 2026	501-1,000	401 contacts →
	Partial evidence “We believe successful businesses are underpinned by quality IT infrastructure.” Source: RevenueBase Database · checked Sep 24, 2026
8	Sandhata Technologies	Indirect evidence	London, United KingdomHQ checked Sep 24, 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 24, 2026
9	Ubique Systems	Partial evidence	London, United KingdomHQ checked Sep 24, 2026	501-1,000	333 contacts →
	Partial evidence “Ubique Systems is a fast growing multifaceted organization which offers a comprehensive array of outsourcing and consulting services for its customers, including recruitment…” Source: RevenueBase Database · checked Sep 24, 2026
10	Damco Solutions Limited	Indirect evidence	London, United KingdomHQ checked Sep 24, 2026	1,001-5,000	327 contacts →
	Indirect evidence “Damco Solutions Limited is a specialist software solutions and services & a business process outsourcing services company.” Source: RevenueBase Database · checked Sep 24, 2026
11	Cartesian	Partial evidence	London, United KingdomHQ checked Sep 24, 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 24, 2026
12	Elixirr	Partial evidence	London, United KingdomHQ checked Sep 24, 2026	501-1,000	275 contacts →
	Partial evidence “An award-winning global consulting firm working with clients across a diverse range of markets, industries and geographies.” Source: RevenueBase Database · checked Sep 24, 2026
13	The Adaptavist Group	Indirect evidence	London, United KingdomHQ checked Sep 24, 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 24, 2026
14	Parser	Indirect evidence	London, United KingdomHQ checked Sep 24, 2026	201-500	242 contacts →
	Indirect evidence “At Parser we help organisations deliver impact through technology.” Source: RevenueBase Database · checked Sep 24, 2026
15	Flat Rock Technology	Indirect evidence	London, United KingdomHQ checked Sep 24, 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 24, 2026
16	Tmotions Global Limited	Indirect evidence	London, United KingdomHQ checked Sep 24, 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 24, 2026
17	Cisilion	Indirect evidence	London, United KingdomHQ checked Sep 24, 2026	51-200	194 contacts →
	Indirect evidence “Combining market-leading tech with world-class service, we go above and beyond expectations to ensure our clients are ready for a digital future.” Source: RevenueBase Database · checked Sep 24, 2026
18	Eappsys	Indirect evidence	London, United KingdomHQ checked Sep 24, 2026	51-200	193 contacts →
	Indirect evidence “eAppSys is a systems integrator that is focused exclusively on supporting the core enterprise application systems within Oracle On-Premise and Cloud Applications.” Source: RevenueBase Database · checked Sep 24, 2026
19	Azurian	Indirect evidence	London, United KingdomHQ checked Sep 24, 2026	201-500	178 contacts →
	Indirect evidence “The future has never moved this fast.” Source: RevenueBase Database · checked Sep 24, 2026
20	Interex Group	Indirect evidence	London, United KingdomHQ checked Sep 24, 2026	51-200	160 contacts →
	Indirect evidence “InterEx Group is becoming the strategic partner of choice for organizations undergoing digital, business, and technology transformation.” Source: RevenueBase Database · checked Sep 24, 2026
21	ORG	Indirect evidence	London, United KingdomHQ checked Sep 24, 2026	1,001-5,000	139 contacts →
	Indirect evidence “We believe that change is an opportunity to thrive.” Source: RevenueBase Database · checked Sep 24, 2026
22	IBU	Partial evidence	London, United KingdomHQ checked Sep 24, 2026	1,001-5,000	139 contacts →
	Partial evidence “We are the most trusted consulting & Information Technology service partner, who has been thriving hard to deliver customer-centric and proven global competence to our clients all…” Source: RevenueBase Database · checked Sep 24, 2026
23	Opticoreit	Partial evidence	London, United KingdomHQ checked Sep 24, 2026	51-200	120 contacts →
	Partial evidence “OpticoreIT is an IT Consultancy founded in 2013 to bridge a gap in the market between the major IT services providers and the consultancy market.” Source: RevenueBase Database · checked Sep 24, 2026
24	Glue Reply	Partial evidence	London, United KingdomHQ checked Sep 24, 2026	51-200	118 contacts →
	Partial evidence “WHO WE ARE Glue Reply is a business consultancy that strives to help its clients achieve their future potential by developing solutions that often for the first time align IT…” Source: RevenueBase Database · checked Sep 24, 2026
25	Bedford Consulting	Indirect evidence	London, United KingdomHQ checked Sep 24, 2026	51-200	117 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 24, 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: consulting IT services. 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 consulting IT services.
Partial evidence: Its own public description names part of consulting IT services, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name consulting IT services. 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 2,681 consulting IT services based in London, United Kingdom

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Consulting IT services based in London, United Kingdom at a glance

As of Sep 24, 2026

27.9%Verified-email coverage

20.1Average contacts per company

1-10Median size (employees)

100.0%Largest-city concentration · London

Sep 24, 2026Page data refreshed

Companies by employee count

1-10

1,704

11-50

648

51-200

223

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 2,681 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 consulting IT services, 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 “consulting IT services”. 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 consulting IT services), 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 consulting IT services, 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, 15,009 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 24, 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.

Consulting IT services by metro in the United Kingdom

Consulting IT services in London2681
Consulting IT services in Manchester184
Consulting IT services in Birmingham132
Consulting IT services in Bristol105
Consulting IT services in Reading88
Consulting IT services in Leeds85
Consulting IT services in Glasgow83
Consulting IT services in Edinburgh73
Consulting IT services in Milton Keynes58
Consulting IT services in Sheffield55
Consulting IT services in Cambridge52
Consulting IT services in Coventry50
Consulting IT services in Cardiff44
Consulting IT services in Nottingham44
Consulting IT services in Leicester43
Consulting IT services in Northampton41
Consulting IT services in Liverpool39
Consulting IT services in Harrow36
Consulting IT services in Derby34
Consulting IT services in Oxford34
Consulting IT services in Southampton34
Consulting IT services in Brighton31
Consulting IT services in Watford30
Consulting IT services in York30
Consulting IT services in Newcastle Upon Tyne29
Consulting IT services in Aberdeen28
Consulting IT services in Bournemouth28
Consulting IT services in Ilford28
Consulting IT services in Slough28
Consulting IT services in Poole27
Consulting IT services in Guildford26
Consulting IT services in Belfast25
Consulting IT services in Swindon25
Consulting IT services in Warrington25

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 consulting IT services, 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 consulting IT services are there based in London, United Kingdom?

RevenueBase identified 2,681 consulting IT services 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?

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

Which city has the most consulting IT services?

London leads with 2681 headquartered companies, followed by Manchester (184) and Birmingham (132).

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 15,009 verified decision-maker contacts tracked across these 2,681 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 24, 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.