Company lists · Data refreshed September 2026

Top 25 Oil filled transformer manufacturers based in the United Kingdom

Name: Oil filled transformer manufacturers based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 30, 2026 67 companies tracked

RevenueBase identified 67 oil filled transformer manufacturers headquartered in the United Kingdom as of September 2026 and tracks 1,245 professional contacts across them, including 372 with verified work emails. Leeds is the largest hub.

This list covers oil filled transformer manufacturers 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 30, 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 30, 2026 86% judged on-target in blind review

67Companies

1,245Contacts tracked

372Verified emails

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The 25 largest oil filled transformer manufacturers based in the United Kingdom

Ranked by team size

Top 25 of 67 oil filled transformer manufacturers based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 30, 2026. RevenueBase Smart Search rates how each company's information relates to oil filled transformer manufacturers: 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	Brush Group	Indirect evidence	Loughborough, United KingdomHQ checked Sep 30, 2026	501-1,000	367 contacts →
	Indirect evidence “We support the global drive to net zero with innovative, engineered solutions that address grid resilience and systems challenges, facilitate electrification of transport and…” Source: RevenueBase Database · checked Sep 30, 2026
2	Wilson Power Solutions	Strong evidence	Leeds, United KingdomHQ checked Sep 30, 2026	51-200	136 contacts →
	Strong evidence “Wilson Power Solutions is a power and distribution transformer manufacturer, recognised for pioneering amorphous transformer core technology, making it home to Europe's most…” Source: RevenueBase Database · checked Sep 30, 2026
3	Slaters Electricals	Indirect evidence	Tollbridge Road, United KingdomHQ checked Sep 30, 2026	51-200	42 contacts →
	Indirect evidence “Established for over 100 years, Slaters Electricals Ltd are experts in LV and HV power distribution equipment, installation and support solutions.” Source: RevenueBase Database · checked Sep 30, 2026
4	Morris Line Engineering LTD	Indirect evidence	Bridgend Industrial Estate, United KingdomHQ checked Sep 30, 2026	51-200	40 contacts →
	Indirect evidence “MLE was established in 1976 to provide specialist design & manufacturing services for 12kV – 145kV overhead line disconnectors & switches.” Source: RevenueBase Database · checked Sep 30, 2026
5	Bowers Electricals LTD	Indirect evidence	Heanor, United KingdomHQ checked Sep 30, 2026	11-50	38 contacts →
	Indirect evidence “Bowers Electricals are in the 70th year of powering industry and one of the worlds biggest designers and suppliers of energy saving EU Compliant Tier 1 and Tier 2 Distribution and…” Source: RevenueBase Database · checked Sep 30, 2026
6	Transformers & Rectifiers LTD	Strong evidence	Guildford, United KingdomHQ checked Sep 30, 2026	51-200	36 contacts →
	Strong evidence “Transformers & Rectifiers Ltd is a globally recognised specialist in the design, manufacture, and maintenance of liquid-filled and dry-type transformers, as well as transformer…” Source: RevenueBase Database · checked Sep 30, 2026
7	Industrial Switchgear Services LTD	Indirect evidence	Hyde, United KingdomHQ checked Sep 30, 2026	51-200	30 contacts →
	Indirect evidence “ISS Ltd are a HV/LV Power Engineering company operating nationwide, undertaking Turnkey Electrical Distribution Projects and Site Service activities, including installation…” Source: RevenueBase Database · checked Sep 30, 2026
8	Rosh Engineering LTD	Partial evidence	Blaydon On Tyne, United KingdomHQ checked Sep 30, 2026	11-50	28 contacts →
	Partial evidence “Power transformer repair, refurbishment, supply & installation and enhancement throughout the UK and northern Europe.” Source: RevenueBase Database · checked Sep 30, 2026
9	Lucy Switchgear	Indirect evidence	Thame, United KingdomHQ checked Sep 30, 2026	11-50	24 contacts →
	Indirect evidence “Best-in-class products from Lucy Electric - experts in secondary power distriution specialising in high performance medium and low voltage switchgear for utility, industrial and…” Source: RevenueBase Database · checked Sep 30, 2026
10	TMC LTD	Strong evidence	Maldon, United KingdomHQ checked Sep 30, 2026	11-50	24 contacts →
	Strong evidence “TMC (Transformer Manufacturing Company) is a British manufacturer of transformers, power distribution equipment, and associated wound products, with a heritage dating back to 1981.” Source: RevenueBase Database · checked Sep 30, 2026
11	IST Power Limited	Strong evidence	Leicester, United KingdomHQ checked Sep 30, 2026	51-200	19 contacts →
	Strong evidence “iST POWER LIMITED is a UK-based manufacturer of high-performance transformers, reactors, and wound components-serving critical infrastructure and industrial applications for over…” Source: RevenueBase Database · checked Sep 30, 2026
12	Carroll & Meynell Transformers	Strong evidence	Eaglescliffe, United KingdomHQ checked Sep 30, 2026	11-50	18 contacts →
	Strong evidence “Carroll and Meynell Transformers Ltd have excelled in the design & manufacture of transformers since 1970.” Source: RevenueBase Database · checked Sep 30, 2026
13	KES Power & Light LTD	Partial evidence	Southampton, United KingdomHQ checked Sep 30, 2026	11-50	18 contacts →
	Partial evidence “Kes is a leading uk electrical distribution and temporary lighting manufacturer who have been trading since the mid-seventies in south-east london.” Source: RevenueBase Database · checked Sep 30, 2026
14	GR Electrical Services Limited	Partial evidence	Sherburn In Elmet, United KingdomHQ checked Sep 30, 2026	11-50	15 contacts →
	Partial evidence “Introduction Established in 1975 and with over 50 years’ experience, GR Electrical Services Ltd is one of the UK’s leading manufacturers in the switchboard industry.” Source: RevenueBase Database · checked Sep 30, 2026
15	Electro-Wind Limited	Strong evidence	Stoke-on-trent, United KingdomHQ checked Sep 30, 2026	11-50	14 contacts →
	Strong evidence “About Electro-Wind Limited Established in 1979, Electro-Wind Limited is one of the UK's leading independent manufacturers of custom-built transformers, dry type transformers…” Source: RevenueBase Database · checked Sep 30, 2026
16	Transerv Europe Limited	Partial evidence	Stafford, United KingdomHQ checked Sep 30, 2026	11-50	9 contacts →
	Partial evidence “Transerv Europe Limited provide specialist technical services associated with all aspects of installation, commissioning and maintenance of power and distribution transformers, to…” Source: RevenueBase Database · checked Sep 30, 2026
17	Instrument Transformers Limited ITL	Strong evidence	East Kilbride, United KingdomHQ checked Sep 30, 2026	11-50	9 contacts →
	Strong evidence “Instrument Transformers Limited (ITL) is a UK-based designer and manufacturer of Current Transformers (CTs), Voltage Transformers (VTs), sensors, and asset monitoring solutions…” Source: RevenueBase Database · checked Sep 30, 2026
18	Abel Power & Control Solutions LTD	Indirect evidence	Nottinghamshire, United KingdomHQ checked Sep 30, 2026	11-50	7 contacts →
	Indirect evidence “ABEL are an electrical engineering and manufacturing company providing power, control and automation solutions for a wide range of industries both in the UK and worldwide.” Source: RevenueBase Database · checked Sep 30, 2026
19	R Baker Electrical LTD	Indirect evidence	Liverpool, United KingdomHQ checked Sep 30, 2026	11-50	7 contacts →
	Indirect evidence “R BAKER (ELECTRICAL) LTD Founded by Robert Baker in 1982, R Baker (Electrical) Ltd has enjoyed substantial growth ever since.” Source: RevenueBase Database · checked Sep 30, 2026
20	Electrical Distribution Solutions	Indirect evidence	Wolverhampton, United KingdomHQ checked Sep 30, 2026	1-10	6 contacts →
	Indirect evidence “We at Electrical Distribution Solutions deliver tailored solutions to the electrical distribution and control needs of business, large or small.” Source: RevenueBase Database · checked Sep 30, 2026
21	CK Beckett Transformers & Switchgear 2017 LTD	Partial evidence	Barnsley, United KingdomHQ checked Sep 30, 2026	1-10	4 contacts →
	Partial evidence “Our most recent development is CK Beckett – Transformers & Switchgear Limited – Here we hold a substantial stock of a wide range of both transformers and switchgear.” Source: RevenueBase Database · checked Sep 30, 2026
22	FT Transformers UK LTD	Partial evidence	Kings Norton, United KingdomHQ checked Sep 30, 2026	11-50	4 contacts →
	Partial evidence “FT Transformers UK Ltd, formerly known as FT power Transformers & Forrest Transformers.” Source: RevenueBase Database · checked Sep 30, 2026
23	GBE UK	Indirect evidence	Leeds, United KingdomHQ checked Sep 30, 2026	51-200	3 contacts →
	Indirect evidence “GBE.” Source: RevenueBase Database · checked Sep 30, 2026
24	Switchgear Engineering Services LTD	Indirect evidence	Audenshaw, United KingdomHQ checked Sep 30, 2026	11-50	3 contacts →
	Indirect evidence “SES provides comprehensive, cost effective solutions for the switchgear industry.” Source: RevenueBase Database · checked Sep 30, 2026
25	Webster-Wilkinson LTD	Strong evidence	Telford, United KingdomHQ checked Sep 30, 2026	11-50	3 contacts →
	Strong evidence “For over 50 years, Webster-Wilkinson have designed, manufactured and supplied a comprehensive range of Transformer Components to the Transmission & Distribution marketplace – both…” Source: RevenueBase Database · checked Sep 30, 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: oil filled transformer manufacturers. 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 oil filled transformer manufacturers.
Partial evidence: Its own public description names part of oil filled transformer manufacturers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name oil filled transformer manufacturers. 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 67 oil filled transformer manufacturers based in the United Kingdom

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Oil filled transformer manufacturers based in the United Kingdom at a glance

As of Sep 30, 2026

29.9%Verified-email coverage

18.6Average contacts per company

11-50Median size (employees)

7.5%Largest-city concentration · Leeds

Sep 30, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

501-1,000

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 67 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 oil filled transformer manufacturers, 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 “oil filled transformer manufacturers”. 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 oil filled transformer manufacturers), 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 oil filled transformer manufacturers, 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, 372 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 30, 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 oil filled transformer manufacturers, 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 oil filled transformer manufacturers are there based in the United Kingdom?

RevenueBase identified 67 oil filled transformer manufacturers 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?

Brush Group, headquartered in Loughborough, tops this list with the largest team on record.

Which city has the most oil filled transformer manufacturers?

Leeds leads with 5 headquartered companies, followed by London (5) and Manchester (3).

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 372 verified decision-maker contacts tracked across these 67 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 30, 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.