It was known as the HWM-Cadillac when the Avery Brothers imported it. It later used a variety of engines including a Continental aircraft engine, and both Ford and Chevrolet V8s. It was entered as the HWM-Thunderbird with the Ford engine and as a HWM-Corvette with the Chev.
After the Avery ownership a number of drivers raced the car. Roly Levis, Peter Haskett, Ron Roycroft, John Donnelly, Graeme Hallen and John Monehan all drove it with varying degrees of success.