Company lists · Data refreshed September 2026

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

Name: Federal IT 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 28, 2026 221 companies tracked

RevenueBase identified 221 federal IT consulting firms headquartered in London, United Kingdom as of September 2026 and tracks 17,932 professional contacts across them, including 934 with verified work emails. Across the United Kingdom, London is the largest hub for this category.

This list covers federal IT 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 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

221Companies

17,932Contacts tracked

934Verified emails

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

Ranked by team size

Top 25 of 221 federal IT consulting firms based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to federal IT 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	KOCHO	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	201-500	295 contacts →
	Indirect evidence “At Kocho, we believe greatness lies in everyone.” Source: RevenueBase Database · checked Sep 28, 2026
2	Flat Rock Technology	Indirect evidence	London, United KingdomHQ checked Sep 28, 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 28, 2026
3	Conosco	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	105 contacts →
	Indirect evidence “Cybersecurity specialists providing technology and telecoms solutions that gives you the leadership, experience and resilience you need to build and secure the future of work.” Source: RevenueBase Database · checked Sep 28, 2026
4	Oryxalign	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	99 contacts →
	Indirect evidence “OryxAlign creates true alignment that delivers the right outcomes for all.” Source: RevenueBase Database · checked Sep 28, 2026
5	Constor Solutions	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	87 contacts →
	Indirect evidence “At Constor Solutions, we believe that technology is the backbone of a successful business.” Source: RevenueBase Database · checked Sep 28, 2026
6	Principle ONE	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	78 contacts →
	Partial evidence “Principle One provides Systems Engineering, Architecture and Business Consulting services within the Law Enforcement, National Security, Health and wider public sector.” Source: RevenueBase Database · checked Sep 28, 2026
7	Baseel Partners	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	1,001-5,000	78 contacts →
	Strong evidence “We offer a broad portfolio of IT and consulting services covering Governance and Strategy, Cloud, Data, Cybersecurity, Infrastructure and Applications, Managed IT and Security.” Source: RevenueBase Database · checked Sep 28, 2026
8	Instant On IT	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	69 contacts →
	Partial evidence “Helping businesses accomplish more IT Management, Strategy and Cloud, IT Security and AI Solutions Office locations: Central London, New Zealand” Source: RevenueBase Database · checked Sep 28, 2026
9	6point6 Part Of Accenture	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	201-500	68 contacts →
	Indirect evidence “6point6 drives the right change in an organisation through the positive impact of technology.” Source: RevenueBase Database · checked Sep 28, 2026
10	Cloudplexo	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	54 contacts →
	Partial evidence “CloudPlexo is a global technology consulting firm helping organizations transform, innovate, and build resilience through Cloud, AI, and Cybersecurity.” Source: RevenueBase Database · checked Sep 28, 2026
11	Diegesis Limited	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	52 contacts →
	Partial evidence “Diegesis is a business technology and IT systems integration company that specialises in Decision Support Solutions.” Source: RevenueBase Database · checked Sep 28, 2026
12	Pace Integration	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	47 contacts →
	Indirect evidence “Pace Integration is a unique technology consultancy that solves your integration challenge – focused on enterprise systems integration strategy, architecture and design that is…” Source: RevenueBase Database · checked Sep 28, 2026
13	Cloudcoco PLC	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	32 contacts →
	Partial evidence “CloudCoCo helps organisations modernise, secure and scale their IT with services designed for the way businesses work now.” Source: RevenueBase Database · checked Sep 28, 2026
14	Stealth IT Consulting	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	24 contacts →
	Partial evidence “We are a Digital, Data and Cloud technology consultancy, specialising in delivering solutions to clients across financial services, government, management consulting/outsourcing…” Source: RevenueBase Database · checked Sep 28, 2026
15	work2gether.io	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	23 contacts →
	Strong evidence “Empowering Elite Brands in the Digital Landscape: Your IT Consulting and Services Partner Transforming the Future with Cloud Solutions Technologies!” Source: RevenueBase Database · checked Sep 28, 2026
16	Celon Group	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	19 contacts →
	Indirect evidence “At Celon Group Limited, we are a dedicated team offering an array of technology services, including advanced Cybersecurity services, expert Consultancy, comprehensive Managed…” Source: RevenueBase Database · checked Sep 28, 2026
17	Digital Devices LTD IT Tailored To Your Needs	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	19 contacts →
	Partial evidence “Working in close partnership with both government and corporate sectors since 2006, DD would go above and beyond the norm of standard IT to ensure our client gets full exposure to…” Source: RevenueBase Database · checked Sep 28, 2026
18	Sinevis	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	17 contacts →
	Partial evidence “We are a leading cybersecurity services organization with more than a decade of proven expertise in consulting, solution implementation and managed services.” Source: RevenueBase Database · checked Sep 28, 2026
19	Vits LTD	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	16 contacts →
	Partial evidence “Your Trusted Partner in Cybersecurity & 360 IT Support Founded in 2004, VITS has built a reputation for protecting businesses across the globe with robust, responsive, and…” Source: RevenueBase Database · checked Sep 28, 2026
20	Accordant Solutions LTD	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	14 contacts →
	Partial evidence “At Accordant we understand the changing needs of business IT.” Source: RevenueBase Database · checked Sep 28, 2026
21	Fusion4it	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	12 contacts →
	Partial evidence “Fusion4IT is a trusted technology partner delivering proactive, secure, and scalable IT solutions-providing the technology that keeps your business ahead.” Source: RevenueBase Database · checked Sep 28, 2026
22	Asygma	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	12 contacts →
	Indirect evidence “At Asygma, we're more than a technology provider; we're your trusted advisor and partner in growth.” Source: RevenueBase Database · checked Sep 28, 2026
23	Tammwe Buildateam AI	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	12 contacts →
	Indirect evidence “Tammwe helps organisations unlock faster, smarter, and more cost-effective digital transformation.” Source: RevenueBase Database · checked Sep 28, 2026
24	Bunker Technical Solutions	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	11 contacts →
	Partial evidence “Our Core Values & Our mission are built on one goal: to be the most trusted, forward thinking IT partner you’ve ever worked with.” Source: RevenueBase Database · checked Sep 28, 2026
25	Cloudmatters	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	10 contacts →
	Partial evidence “IT Support \| Cyber Security \| Cloud Management \| IT Strategy” 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: federal IT 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 federal IT consulting firms.
Partial evidence: Its own public description names part of federal IT consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name federal IT 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 221 federal IT consulting firms based in London, United Kingdom

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

As of Sep 28, 2026

5.2%Verified-email coverage

81.1Average contacts per company

1-10Median size (employees)

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

134

11-50

51-200

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 221 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 federal IT 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 “federal IT 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 federal IT 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 federal IT 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, 934 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.

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

RevenueBase identified 221 federal IT 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?

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

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

London leads the United Kingdom with 221 headquartered companies, followed by Manchester (15) and Birmingham (12).

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 934 verified decision-maker contacts tracked across these 221 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.