He developed it into a commercially viable vehicle and founded the Invacar Ltd in 1946 and won a major contract with the Ministry of Pensions for national supply of transport for the physically disabled throughout the 1950s and 1960s.

The motorcycles were really a sideline for the main business of producing the three-wheeled invalid cars, so development of the prototypes had to be fitted in when the production schedule allowed.

Made from LM6 silicon-aluminium alloy, it was claimed to be stronger than tubular steel and proved capable of standing up to the rough treatment of international off-road trials competition.

[4] The Greeves range of motorbikes, with small but powerful engines and light strong frames proved very successful in competition, beating the bigger factories heavier and larger capacity motorcycles.

[2] Bert Greeves was appointed Member of the Order of the British Empire (MBE) in the 1972 New Year Honours,[8] in recognition of the work he had done for the disabled through Invacar.