Company lists · Data refreshed September 2026

Top 23 Legacy system modernization consultancies based in the United Kingdom

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

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 583 companies tracked

RevenueBase identified 583 company matches for legacy system modernization consultancies associated with the United Kingdom as of September 2026 and tracks 5,321 professional contacts across them, including 1,100 with verified work emails. London is the largest hub.

This list covers company matches for legacy system modernization consultancies associated with the United Kingdom, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed September 28, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 SmartSearch · Exact Recorded Sep 28, 2026 How this list was built

583Companies

5,321Contacts tracked

1,100Verified emails

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The 23 largest legacy system modernization consultancies based in the United Kingdom

Ranked by team size

Top 23 of 583 company matches for legacy system modernization consultancies based in the United Kingdom, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 28, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	Parser	Exact match	London, United KingdomHQ recorded Sep 28, 2026	201-500	242 contacts →
	Exact match “At Parser we help organisations deliver impact through technology.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
2	Codurance	Exact match	London, United KingdomHQ recorded Sep 28, 2026	201-500	176 contacts →
	Exact match “For over 13 years, Codurance has helped businesses and their boards solve complex software challenges, often the ones that have resisted previous attempts and now carry real…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
3	Infosight Consulting	Exact match	London, United KingdomHQ recorded Sep 28, 2026	201-500	121 contacts →
	Exact match “At Infosight, we architect the future of enterprises by engineering your digital core and activating the intelligence within.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
4	Neosalpha Technologies	Exact match	Maidenhead, United KingdomHQ recorded Sep 28, 2026	51-200	97 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
5	Codex Software	Exact match	Cirencester, United KingdomHQ recorded Sep 28, 2026	51-200	63 contacts →
	Exact match “Codex makes software simple, strategic, and reliable.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
6	Wavex Technology LTD	Exact match	Liverpool Street, United KingdomHQ recorded Sep 28, 2026	51-200	60 contacts →
	Exact match “Wavex offers a fresh approach to improving and modernising managed services.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
7	Estafet	Exact match	Richmond, United KingdomHQ recorded Sep 28, 2026	51-200	56 contacts →
	Exact match “At Estafet, we don’t just optimize processes - we revolutionize how enterprises operate.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
8	Cloudplexo	Exact match	London, United KingdomHQ recorded Sep 28, 2026	51-200	54 contacts →
	Exact match “CloudPlexo is a global technology consulting firm helping organizations transform, innovate, and build resilience through Cloud, AI, and Cybersecurity.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
9	Diegesis Limited	Exact match	London, United KingdomHQ recorded Sep 28, 2026	51-200	52 contacts →
	Exact match “Diegesis is a business technology and IT systems integration company that specialises in Decision Support Solutions.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
10	S P A Enterprise Services LTD	Exact match	Uxbridge, United KingdomHQ recorded Sep 28, 2026	51-200	49 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
11	Uxli Limited	Exact match	Suite 14-7, United KingdomHQ recorded Sep 28, 2026	51-200	49 contacts →
	Exact match “UXLI is a UK-based data and AI consultancy with over a decade of experience helping organisations unlock value from their data.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
12	Global Vibe Technologies LTD	Exact match	London, United KingdomHQ recorded Sep 28, 2026	11-50	48 contacts →
	Exact match “Global Vibe Technologies Ltd Empowering Growth Through Strategic IT Solutions.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
13	Pace Integration	Exact match	London, United KingdomHQ recorded Sep 28, 2026	51-200	47 contacts →
	Exact match “Pace Integration is a unique technology consultancy that solves your integration challenge – focused on enterprise systems integration strategy, architecture and design that is…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
14	Bespoke IT Solutions UK	Exact match	Fleet, United KingdomHQ recorded Sep 28, 2026	11-50	34 contacts →
	Exact match “When IT feels hard work, frustrating, or unreliable, it slows everything down.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
15	Flynet	Exact match	Burwell, United KingdomHQ recorded Sep 28, 2026	11-50	32 contacts →
	Exact match “Since 1995 Flynet have been building some of the industry's most sophisticated web based solutions for Mainframe, Unix, IBM i, VMS, VAX and MultiValue systems.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
16	Camwood	Exact match	London, United KingdomHQ recorded Sep 28, 2026	51-200	31 contacts →
	Exact match “Camwood: Igniting Enterprise Innovation for 25 Years.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
17	Simplex Services	Exact match	Brighton, United KingdomHQ recorded Sep 28, 2026	11-50	28 contacts →
	Exact match “Simplex Services is an IT consulting and implementation services provider that responds to clear and robust business needs and helps accelerate the digital transformation of…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
18	The RAD Consulting Group	Exact match	London, United KingdomHQ recorded Sep 28, 2026	11-50	27 contacts →
	Exact match “RAD is a technology consultancy specialising in digital platform modernisation for property, retail and financial services organisations.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
19	Coremaker	Exact match	London, United KingdomHQ recorded Sep 28, 2026	11-50	24 contacts →
	Exact match “We are a software engineering studio, that helps large companies tackle innovation head-on.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
20	BIT Solutions	Exact match	Much Hadham, United KingdomHQ recorded Sep 28, 2026	11-50	22 contacts →
	Exact match “Bit Solutions is founded on the philosophy of providing innovative enterprise IT consultancy and solutions that are aligned to our clients’ business requirements.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
21	Rockpool Digital	Exact match	Bristol, United KingdomHQ recorded Sep 28, 2026	11-50	21 contacts →
	Exact match “We help clients deliver digital transformation projects that create better digital experiences.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
22	Rock Solid Knowledge LTD	Exact match	Bristol, United KingdomHQ recorded Sep 28, 2026	11-50	18 contacts →
	Exact match “In 2009, a group of trainers/consultants got together because they wanted to get involved in larger development projects again - that was the start of Rock Solid Knowledge.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
23	Onyx IT	Exact match	Norwich, United KingdomHQ recorded Sep 28, 2026	11-50	18 contacts →
	Exact match “In this era of Digital Transformation and mobile working our goal is to help your business to run more efficiently with scalable technology at the right price.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “legacy system modernization consultancies”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 23 of 583 legacy system modernization consultancies based in the United Kingdom

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

As of Sep 28, 2026

20.7%Verified-email coverage

9.1Average contacts per company

1-10Median size (employees)

36.9%Largest-city concentration · London

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

397

11-50

135

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 583 companies.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies: Company records associated with the United Kingdom whose business descriptions match “legacy system modernization consultancies” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 1,100 professional contacts with verified work emails across the full matched dataset. 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.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

Legacy system modernization consultancies by metro

Legacy system modernization consultancies in London215

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “legacy system modernization consultancies”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many legacy system modernization consultancies are there based in the United Kingdom?

RevenueBase identified 583 company matches for legacy system modernization consultancies associated with the United Kingdom as of September 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

Parser tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city has the most legacy system modernization consultancies?

London leads with 215 company records, followed by Manchester (17) and Bristol (14).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 1,100 professional contacts with verified work emails tracked across these 583 companies; direct dials are available where recorded.

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 SmartSearch, 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.