At the Ministry of Aviation, he was closely involved in the design of the Rolls-Royce Spey and Tay engines, and the Bristol/Rolls-Royce Pegasus engine which powers the vertical take-off BAE Sea Harrier.
He was involved in the design of several notable engines: the Rolls-Royce Spey and Tay for the Ministry of Aviation, and the Bristol/Rolls-Royce Pegasus for the BAE Sea Harrier.