Company lists · Data refreshed September 2026

Top 25 Legacy system modernization consultants based in the United Kingdom

Name: Legacy system modernization consultants based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 1,038 companies tracked

RevenueBase identified 1,038 legacy system modernization consultants headquartered in the United Kingdom as of September 2026 and tracks 22,582 professional contacts across them, including 2,247 with verified work emails. London is the largest hub.

This list covers legacy system modernization consultants 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 20, 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 20, 2026 86% judged on-target in blind review

1,038Companies

22,582Contacts tracked

2,247Verified emails

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The 25 largest legacy system modernization consultants based in the United Kingdom

Ranked by team size

Top 25 of 1,038 legacy system modernization consultants based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to legacy system modernization consultants: 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	Node4	Indirect evidence	Derby, United KingdomHQ checked Sep 20, 2026	1,001-5,000	628 contacts →
	Indirect evidence “Node4 helps businesses achieve more with secure, AI‑powered cloud and managed service platforms.” Source: RevenueBase Database · checked Sep 20, 2026
2	Reliance Infosystems	Indirect evidence	West End, United KingdomHQ checked Sep 20, 2026	201-500	326 contacts →
	Indirect evidence “As our name suggests, our customers rely on us in providing suitable technology inputs to support their business goals.” Source: RevenueBase Database · checked Sep 20, 2026
3	Waterstons	Indirect evidence	Durham, United KingdomHQ checked Sep 20, 2026	201-500	215 contacts →
	Indirect evidence “We are an IT business with a difference.” Source: RevenueBase Database · checked Sep 20, 2026
4	Infosight Consulting	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	201-500	121 contacts →
	Indirect evidence “At Infosight, we architect the future of enterprises by engineering your digital core and activating the intelligence within.” Source: RevenueBase Database · checked Sep 20, 2026
5	Neosalpha Technologies	Indirect evidence	Maidenhead, United KingdomHQ checked Sep 20, 2026	51-200	97 contacts →
	Indirect evidence “NeosAlpha: Your Trusted Partner in IT Consulting and Digital Transformation Founded in the UK in 2017, NeosAlpha is a niche IT consulting and services company, that delivers…” Source: RevenueBase Database · checked Sep 20, 2026
6	Baseel Partners	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	1,001-5,000	78 contacts →
	Indirect 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 20, 2026
7	BIT Wave Solutions Limited	Indirect evidence	Reading, United KingdomHQ checked Sep 20, 2026	11-50	75 contacts →
	Indirect evidence “Headquartered at Reading, Berkshire in United Kingdom, Bit Wave Solutions enables global businesses to build their future by directing clients’ innovation & customization agenda.” Source: RevenueBase Database · checked Sep 20, 2026
8	Intelex Systems Limited	Partial evidence	Solihull, United KingdomHQ checked Sep 20, 2026	51-200	66 contacts →
	Partial evidence “Intelex Systems is a leading technology consulting, IT services and Right sourcing solutions company, delivering technology driven business solutions that meet strategic…” Source: RevenueBase Database · checked Sep 20, 2026
9	Wavex Technology LTD	Indirect evidence	Liverpool Street, United KingdomHQ checked Sep 20, 2026	51-200	60 contacts →
	Indirect evidence “Wavex offers a fresh approach to improving and modernising managed services.” Source: RevenueBase Database · checked Sep 20, 2026
10	Estafet	Indirect evidence	Richmond, United KingdomHQ checked Sep 20, 2026	51-200	56 contacts →
	Indirect evidence “At Estafet, we don’t just optimize processes - we revolutionize how enterprises operate.” Source: RevenueBase Database · checked Sep 20, 2026
11	Cloudplexo	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	54 contacts →
	Indirect 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 20, 2026
12	GSC Technologies Limited	Indirect evidence	Dartford, United KingdomHQ checked Sep 20, 2026	201-500	53 contacts →
	Indirect evidence “At GSC Technologies, we are architects of digital transformation, empowering businesses with innovative IT solutions that drive growth and efficiency.” Source: RevenueBase Database · checked Sep 20, 2026
13	Diegesis Limited	Partial evidence	London, United KingdomHQ checked Sep 20, 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 20, 2026
14	Techsol	Indirect evidence	Cardiff, United KingdomHQ checked Sep 20, 2026	51-200	51 contacts →
	Indirect evidence “Experts in digital transformation, we work closely with you to plan, prepare, and implement integrated technologies to revolutionise the way you work.” Source: RevenueBase Database · checked Sep 20, 2026
15	Eclature Technologies	Indirect evidence	Daresbury, United KingdomHQ checked Sep 20, 2026	201-500	50 contacts →
	Indirect evidence “Eclature Technologies stands for engineering innovation, excellence, and reliability.” Source: RevenueBase Database · checked Sep 20, 2026
16	S P A Enterprise Services LTD	Partial evidence	Uxbridge, United KingdomHQ checked Sep 20, 2026	51-200	49 contacts →
	Partial evidence “S P A has been coined as our company name and the acronym which articulates three vital areas of an enterprise - Systems, Processes and Applications – which requires being robust…” Source: RevenueBase Database · checked Sep 20, 2026
17	Uxli Limited	Partial evidence	Suite 14-7, United KingdomHQ checked Sep 20, 2026	51-200	49 contacts →
	Partial evidence “UXLI is a UK-based data and AI consultancy with over a decade of experience helping organisations unlock value from their data.” Source: RevenueBase Database · checked Sep 20, 2026
18	Global Vibe Technologies LTD	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	11-50	48 contacts →
	Indirect evidence “Global Vibe Technologies Ltd Empowering Growth Through Strategic IT Solutions.” Source: RevenueBase Database · checked Sep 20, 2026
19	Pace Integration	Strong evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	47 contacts →
	Strong 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 20, 2026
20	Kinetic IT LTD	Indirect evidence	Erith, United KingdomHQ checked Sep 20, 2026	11-50	47 contacts →
	Indirect evidence “It’s all about making a difference The world of IT is an ever-evolving industry with new developments in technology emerging constantly.” Source: RevenueBase Database · checked Sep 20, 2026
21	Elevation Services	Indirect evidence	Manchester, United KingdomHQ checked Sep 20, 2026	51-200	45 contacts →
	Indirect evidence “Wait, can we actually do that?" is our favourite thing to hear.” Source: RevenueBase Database · checked Sep 20, 2026
22	Holker IT	Partial evidence	Burnley, United KingdomHQ checked Sep 20, 2026	11-50	39 contacts →
	Partial evidence “At Holker IT our aim is to improve our clients’ businesses through strategic advice, implementation and on-going support of IT systems and processes, from single to multi-server…” Source: RevenueBase Database · checked Sep 20, 2026
23	Somo Global	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	201-500	38 contacts →
	Indirect evidence “Somo is now CI & T.” Source: RevenueBase Database · checked Sep 20, 2026
24	HP Infosystem, LLC	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	35 contacts →
	Indirect evidence “HP Infosystem is a comprehensive consulting and IT Services provider of absolute tech-business solutions having strong expertise and extensive technical skills with global…” Source: RevenueBase Database · checked Sep 20, 2026
25	Bespoke IT Solutions UK	Indirect evidence	Fleet, United KingdomHQ checked Sep 20, 2026	11-50	34 contacts →
	Indirect evidence “When IT feels hard work, frustrating, or unreliable, it slows everything down.” Source: RevenueBase Database · checked Sep 20, 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: legacy system modernization consultants. 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 legacy system modernization consultants.
Partial evidence: Its own public description names part of legacy system modernization consultants, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name legacy system modernization consultants. 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 1,038 legacy system modernization consultants based in the United Kingdom

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Legacy system modernization consultants based in the United Kingdom at a glance

As of Sep 20, 2026

10.0%Verified-email coverage

21.8Average contacts per company

1-10Median size (employees)

35.5%Largest-city concentration · London

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

709

11-50

236

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

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 1,038 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 legacy system modernization consultants, 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 “legacy system modernization consultants”. 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 legacy system modernization consultants), 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 legacy system modernization consultants, 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, 2,247 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 20, 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.

Legacy system modernization consultants by metro

Legacy system modernization consultants in London369
Legacy system modernization consultants in Manchester27

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 legacy system modernization consultants, 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 legacy system modernization consultants are there based in the United Kingdom?

RevenueBase identified 1,038 legacy system modernization consultants 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?

Node4, headquartered in Derby, tops this list with the largest team on record.

Which city has the most legacy system modernization consultants?

London leads with 369 headquartered companies, followed by Manchester (27) and Bristol (17).

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 2,247 verified decision-maker contacts tracked across these 1,038 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 20, 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.