Company lists · Data refreshed November 2026

Top 14 Legacy system support companies based in the United Kingdom

RevenueBase identified 31 company matches for legacy system support companies associated with the United Kingdom as of November 2026 and tracks 439 professional contacts across them, including 259 with verified work emails. London is the largest hub.

This list covers company matches for legacy system support companies 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 November 6, 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 Nov 6, 2026 How this list was built
31Companies
439Contacts tracked
259Verified emails
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The 14 largest legacy system support companies based in the United Kingdom

Ranked by team size
Top 14 of 31 company matches for legacy system support companies based in the United Kingdom, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Nov 6, 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.
#CompanyRevenueBase SmartSearchHeadquartersEmployeesContacts
1Exact matchCongleton, United KingdomHQ recorded Nov 6, 202611-5028 contacts →

Exact match

“Newcorp is a UK-based IT infrastructure support provider with over 30 years of experience supporting the systems that businesses depend on most.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
2Exact matchBirmingham, United KingdomHQ recorded Nov 6, 202611-5023 contacts →

Exact match

“Kuiper Technology are a dynamic IT Services and Solution Provider providing small, medium and public sector customers with a wide range of Hardware and Software solutions…”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
3Exact matchCroydon, United KingdomHQ recorded Nov 6, 202611-5016 contacts →

Exact match

“Broadgate Infonet is a bespoke software support provider that builds its business on close working relationships with its clients that spans over decades.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
4Exact matchEastbourne, United KingdomHQ recorded Nov 6, 202611-509 contacts →

Exact match

“At computer2cloud, we do things differently by combining technology with genuine partnership to deliver IT that truly supports your business.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
5Exact matchSheffield, United KingdomHQ recorded Nov 6, 20261-108 contacts →

Exact match

“datamills is a friendly IT support and solutions company with a passion for great delivery and customer service.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
6Exact matchBristol, United KingdomHQ recorded Nov 6, 202611-505 contacts →

Exact match

“Microsystem Support is an IT solutions company offering a range of solutions, hardware and services (hardware maintenance, software support, professional services) to the SME…”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
7Exact matchLondon, United KingdomHQ recorded Nov 6, 20261-105 contacts →

Exact match

“North London IT Support provides friendly, dependable IT support and cybersecurity services to SMEs across North London and beyond.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
8Exact matchKings Lynn, United KingdomHQ recorded Nov 6, 20261-105 contacts →

Exact match

“Hardware and infrastructure, business software, service and support.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
9Exact matchHorsham, United KingdomHQ recorded Nov 6, 20261-105 contacts →

Exact match

“Founded in 1986, Powersoft is an independent software consultancy specialising in modernising business‑critical systems and delivering long‑term technical support.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
10Exact matchStockport, United KingdomHQ recorded Nov 6, 20261-103 contacts →

Exact match

“IT Services company specialising in remote support, proactive network monitoring, onsite maintenance, remote working, cloud computing transitions, server client setups for small…”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
11Exact matchLeeds, United KingdomHQ recorded Nov 6, 20261-101 contacts →

Exact match

“We're an experienced team of consultants, engineers, system architects and DevOps practitioners covering all major facets of IT systems including Infrastructure, Networks…”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
12Exact matchManchester, United KingdomHQ recorded Nov 6, 20261-101 contacts →

Exact match

“We are the reliable IT department for your business.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
13Exact matchShaw, United KingdomHQ recorded Nov 6, 20261-101 contacts →

Exact match

“InSync IT Limited is a dynamic and cost effective North West based IT support and service provider to domestic, private and public sector organisations.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
14Exact matchLondon, United KingdomHQ recorded Nov 6, 20261-101 contacts →

Exact match

“Whitehall Systems has been meeting the needs of clients for more than twenty years, a time which has seen many similar companies come and go.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase

Showing 14 of 31 legacy system support companies based in the United Kingdom

See the full list, filter by size, metro and specialty, and access 259 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Legacy system support companies based in the United Kingdom at a glance

As of Nov 6, 2026
59.0%Verified-email coverage
14.2Average contacts per company
1-10Median size (employees)
29.0%Largest-city concentration · London
Nov 6, 2026Page data refreshed

Companies by employee count

1-10
20
11-50
7
51-200
1
201-500
2

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 31 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 support companies” 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 259 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 November 6, 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.

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 support companies”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many legacy system support companies are there based in the United Kingdom?

RevenueBase identified 31 company matches for legacy system support companies associated with the United Kingdom as of November 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?

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

Which city has the most legacy system support companies?

London leads with 9 company records, followed by Birmingham (2) and Bristol (1).

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 259 professional contacts with verified work emails tracked across these 31 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 November 6, 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.