Company lists · Data refreshed September 2026

Top 25 Aftermarket automotive harness suppliers based in the United Kingdom

Name: Aftermarket automotive harness suppliers 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 75 companies tracked

RevenueBase identified 75 aftermarket automotive harness suppliers headquartered in the United Kingdom as of September 2026 and tracks 2,285 professional contacts across them, including 783 with verified work emails. Boston is the largest hub.

This list covers aftermarket automotive harness suppliers 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

75Companies

2,285Contacts tracked

783Verified emails

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The 25 largest aftermarket automotive harness suppliers based in the United Kingdom

Ranked by team size

Top 25 of 75 aftermarket automotive harness suppliers 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 aftermarket automotive harness suppliers: 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	Sews-E	Partial evidence	Newcastle-under-lyme, United KingdomHQ checked Sep 30, 2026	10001+	1,739 contacts →
	Partial evidence “SEWS-E, Sumitomo Electric Wiring Systems (Europe) manufactures and processes wiring harnesses and related parts in countries such as Hungary, Romania, Morocco and Egypt.” Source: RevenueBase Database · checked Sep 30, 2026
2	ASL	Strong evidence	Bolton, United KingdomHQ checked Sep 30, 2026	51-200	126 contacts →
	Strong evidence “Assembly Solutions Ltd (for short, ASL) is a subcontract manufacturer of cable assemblies, wiring harnesses and control panels which supplies manufacturers including Ford, Siemens…” Source: RevenueBase Database · checked Sep 30, 2026
3	Ionix Systems	Partial evidence	Risley, United KingdomHQ checked Sep 30, 2026	501-1,000	35 contacts →
	Partial evidence “Ionix Systems is a specialist designer and manufacturer of wiring harness and woven systems, providing interconnection solutions for aerospace, defence, power generation and other…” Source: RevenueBase Database · checked Sep 30, 2026
4	Q5d	Strong evidence	Portishead, United KingdomHQ checked Sep 30, 2026	11-50	33 contacts →
	Strong evidence “Q5D is an innovative technology company developing tools to automate the production of wiring harnesses for the consumer white goods and electronics, through to the automotive and…” Source: RevenueBase Database · checked Sep 30, 2026
5	Contour Electronics LTD	Indirect evidence	Hook, United KingdomHQ checked Sep 30, 2026	11-50	29 contacts →
	Indirect evidence “Bespoke Interconnect & Value Added Integration Solutions Contour Electronics specialises in designing and manufacturing custom cable assemblies, wiring looms and integrated…” Source: RevenueBase Database · checked Sep 30, 2026
6	Parkinson Harness Technology LTD	Partial evidence	Boston, United KingdomHQ checked Sep 30, 2026	51-200	26 contacts →
	Partial evidence “Parkinson Harness Technology manufacture bespoke electrical solutions including wiring harnesses, control panels, battery/power leads, PCB’s, and control systems.” Source: RevenueBase Database · checked Sep 30, 2026
7	Amphenol Trackwise Designs LTD	Indirect evidence	Stonehouse, United KingdomHQ checked Sep 30, 2026	51-200	22 contacts →
	Indirect evidence “Manufacturing the new generation of interconnect for customers around the world.” Source: RevenueBase Database · checked Sep 30, 2026
8	Horizon Wiring LTD	Partial evidence	Suffolk, United KingdomHQ checked Sep 30, 2026	11-50	21 contacts →
	Partial evidence “Specialist Wiring Harness Manufacturers” Source: RevenueBase Database · checked Sep 30, 2026
9	HCI Systems Limited	Partial evidence	Newport, United KingdomHQ checked Sep 30, 2026	11-50	21 contacts →
	Partial evidence “HCI Systems Limited specialises in Designing and Manufacturing bespoke Electrical Systems for the Automotive, Autosport, Marine and Commercial market sectors.” Source: RevenueBase Database · checked Sep 30, 2026
10	Westwire Harnessing LTD	Partial evidence	Swindon, United KingdomHQ checked Sep 30, 2026	11-50	20 contacts →
	Partial evidence “Westwire Harnessing are specialists in design, development and manufacturing of wire harnessing for transport, aerospace and military.” Source: RevenueBase Database · checked Sep 30, 2026
11	SIC LTD	Partial evidence	Swansea, United KingdomHQ checked Sep 30, 2026	51-200	17 contacts →
	Partial evidence “SIC (Swansea Industrial Components) has been making wiring harnesses and cable assemblies for over 50 years since it was founded in 1964.” Source: RevenueBase Database · checked Sep 30, 2026
12	Pinnacle Harnesses	Partial evidence	136 Rhosnesni Lane, United KingdomHQ checked Sep 30, 2026	11-50	10 contacts →
	Partial evidence “Pinnacle Harnesses are a leading Wire Harnesses manufacturer that deliver bespoke and exact solutions to our valued customers.” Source: RevenueBase Database · checked Sep 30, 2026
13	Autosparks LTD	Strong evidence	Nottingham, United KingdomHQ checked Sep 30, 2026	51-200	7 contacts →
	Strong evidence “World leading manufacturer & supplier of classic car wiring harnesses and an experienced original equipment manufacturer (OEM).” Source: RevenueBase Database · checked Sep 30, 2026
14	Mobile Centre Limited	Partial evidence	Evesham, United KingdomHQ checked Sep 30, 2026	11-50	7 contacts →
	Partial evidence “Mobile Centre’s primary role is as a distributor of premium automotive based electronics and quality auto electrical products with particular interest in high end automotive…” Source: RevenueBase Database · checked Sep 30, 2026
15	Hayakawa International UK LTD	Indirect evidence	Wrexham, United KingdomHQ checked Sep 30, 2026	11-50	6 contacts →
	Indirect evidence “Hayakawa specialises in the bespoke design and manufacture of wiring, cable assemblies and lighting cables.” Source: RevenueBase Database · checked Sep 30, 2026
16	ST Cross Electronics LTD	Indirect evidence	Southampton, United KingdomHQ checked Sep 30, 2026	11-50	6 contacts →
	Indirect evidence “St Cross Electronics has been manufacturing very high-quality bespoke cable assemblies of all complexities at our fully ISO and also UL approved facility in Southampton for over…” Source: RevenueBase Database · checked Sep 30, 2026
17	Solutions ARE Looming	Partial evidence	Hull, United KingdomHQ checked Sep 30, 2026	1-10	6 contacts →
	Partial evidence “At Solutions Are Looming Ltd, we use state-of-the-art machinery to manufacture a wide range of wiring solutions for bespoke requirements, including cable looms and cable harnesses.” Source: RevenueBase Database · checked Sep 30, 2026
18	Raffenday LTD	Indirect evidence	Wellingborough, United KingdomHQ checked Sep 30, 2026	11-50	5 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 30, 2026
19	Wireco Limited	Partial evidence	Congleton, United KingdomHQ checked Sep 30, 2026	11-50	5 contacts →
	Partial evidence “Wireco have built an impeccable reputation as cable harness assembly specialists who design and manufacture wire harnesses and wiring looms as well as offering a flexible…” Source: RevenueBase Database · checked Sep 30, 2026
20	Cablepoint LTD	Partial evidence	Hull, United KingdomHQ checked Sep 30, 2026	11-50	5 contacts →
	Partial evidence “Cablepoint UK delivers precision-engineered cable assemblies, wiring looms, harnesses and discreet wires - plus full-service box-builds, control panel wiring and over-moulding.” Source: RevenueBase Database · checked Sep 30, 2026
21	Convert Limited	Partial evidence	Edenbridge, United KingdomHQ checked Sep 30, 2026	11-50	5 contacts →
	Partial evidence “Convert Ltd is a UK based manufacturer of complex cable harnesses, cable assemblies, cable looms, interconnect harnesses & process cable sets.” Source: RevenueBase Database · checked Sep 30, 2026
22	Project DC	Partial evidence	Kineton, United KingdomHQ checked Sep 30, 2026	1-10	5 contacts →
	Partial evidence “Project DC was founded to provide superior performance wiring solutions in an industry with limited high quality harness designers and manufacturers.” Source: RevenueBase Database · checked Sep 30, 2026
23	Simtek UK LTD	Indirect evidence	Rochdale, United KingdomHQ checked Sep 30, 2026	1-10	3 contacts →
	Indirect evidence “Simtek UK Ltd was founded by Jay and Ginny Simkins in We are specialists in the design and production of integrated systems; a vehicle constructor can have us develop a system…” Source: RevenueBase Database · checked Sep 30, 2026
24	Level Motorsport Wiring LTD	Strong evidence	Caldicot, United KingdomHQ checked Sep 30, 2026	1-10	2 contacts →
	Strong evidence “Specialising in bespoke wiring harness design & manufacture for all type of automotive, marine, aviation & aerospace” Source: RevenueBase Database · checked Sep 30, 2026
25	Revolution Engineering	Partial evidence	London, United KingdomHQ checked Sep 30, 2026	1-10	2 contacts →
	Partial evidence “Welcome to Revolution Engineering, your all-in-one partner for cutting-edge electronics, bespoke harness manufacturing, and advanced control systems design and development.” 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: aftermarket automotive harness suppliers. 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 aftermarket automotive harness suppliers.
Partial evidence: Its own public description names part of aftermarket automotive harness suppliers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name aftermarket automotive harness suppliers. 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 75 aftermarket automotive harness suppliers based in the United Kingdom

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Aftermarket automotive harness suppliers based in the United Kingdom at a glance

As of Sep 30, 2026

34.3%Verified-email coverage

30.5Average contacts per company

11-50Median size (employees)

4.0%Largest-city concentration · Boston

Sep 30, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

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 75 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 aftermarket automotive harness suppliers, 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 “aftermarket automotive harness suppliers”. 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 aftermarket automotive harness suppliers), 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 aftermarket automotive harness suppliers, 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, 783 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 aftermarket automotive harness suppliers, 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 aftermarket automotive harness suppliers are there based in the United Kingdom?

RevenueBase identified 75 aftermarket automotive harness suppliers 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?

Sews-E, headquartered in Newcastle-Under-Lyme, tops this list with the largest team on record.

Which city has the most aftermarket automotive harness suppliers?

Boston leads with 3 headquartered companies, followed by Hull (2) and London (2).

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 783 verified decision-maker contacts tracked across these 75 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.