
McLaren road car development
Contributed to the development of the McLaren road car.
Client · McLaren
Rj Engineering Processes Ltd · Company 13269372 · Trading heritage since 1975
Active, accounts up to date·subcontractor & supplier·Head office Derby
RJ Engineering has established itself as a leading precision manufacturer serving the Aerospace, Defence, and Nuclear sectors. Over the past 50 years, the company has continually invested in its people, technology, and capabilities to become a trusted one-stop manufacturing partner for its customers. While the business has evolved significantly, its founding ethos of delivering quality, reliability, and exceptional customer support remains at the heart of everything it does.
Founded in 1975, RJ Engineering has grown from a small operation manufacturing hydraulic fittings to a large-scale enterprise operating from over 50,000 sq ft of manufacturing facilities. The company has a strong history of supporting prestigious engineering projects and blue-chip organisations, including Rolls-Royce, Bombardier, and Balfour Beatty. Significant investment in CNC machining technology and the introduction of 5-axis machining have enhanced its ability to manufacture complex tooling and support higher-volume manufacturing.
In recent years, RJ Engineering has expanded its capabilities to offer a complete engineering solution, introducing in-house fabrication, welding, load testing, blasting, and painting services. This has created a true one-stop shop for tooling requirements, allowing the company to maintain complete control over quality, safety, and certification. RJ Engineering is committed to providing a complete, end-to-end tooling solution for its customers, supporting some of the world's most demanding industries.

Contributed to the development of the McLaren road car.
Client · McLaren

Supported the first builds of the Rolls-Royce Trent 1000 and Trent XWB engines.
Client · Rolls-Royce

Played a key role in the first-build and fast-make programmes for the Rolls-Royce Trent 7000, being one of only three manufacturers selected to deliver critical tooling on time and to budget.
Client · Rolls-Royce
Supported the first build of the Rolls-Royce UltraFan programme.
Client · Rolls-Royce
Rolls-Royce, Bombardier, Balfour Beatty, McLaren.
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RJ Engineering is a leading precision manufacturer and one-stop manufacturing partner for tooling, jigs, fixturing, GSE, and general machining/fabrication. Serving Aerospace, Defence, Energy, Nuclear, and Rail industries globally. Their listed services include Steel fabrication, Steel erection, Painting & decorating and M&E contracting.
J A McDonagh Engineering LTD (T/A RJ Engineering) is registered at Unit 14 Northedge Business Park, Alfreton Road, Derby, DE21 4BN, in East Midlands.
J A McDonagh Engineering LTD (T/A RJ Engineering) states that it works across Nationwide.
Accounts filed for the year to 2025 report 2 employees, which places the company in the 1-9 employees band.
J A McDonagh Engineering LTD (T/A RJ Engineering) does not disclose turnover: UK small-company accounts are not required to. Based on creditors in its filed accounts, turnover is likely to fall between £96k and £380k. This is an estimate, not a filed figure.
Companies House lists J A McDonagh Engineering LTD (T/A RJ Engineering) as active, with accounts most recently made up to 2025-01-31.
J A McDonagh Engineering LTD (T/A RJ Engineering) displays ISO 9001, ISO 14001, ISO 45001 and LEEA-approved on its website.
J A McDonagh Engineering LTD (T/A RJ Engineering) works in Industrial, Energy and Infrastructure.
J A McDonagh Engineering LTD (T/A RJ Engineering) was incorporated on 2021-03-16, though the company says it has traded since 1975.
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