1940
The Merlin powered the Hawker Hurricane and Supermarine Spitfire in the Battle of Britain. Demand for the Merlin during the Second World War transformed Rolls-Royce from a relatively small company into a major contender in aero propulsion.

1944
In parallel, Rolls-Royce began development of the aero gas turbine, pioneered by Sir Frank Whittle. The Welland engine entered service in the Gloster Meteor fighter in 1944 and Rolls-Royce had the confidence immediately after the war to commit itself to the gas turbine, in which it had a technological lead.

1953
Rolls-Royce entered the civil aviation market with the Dart in the Vickers Viscount. It was to become the cornerstone of the universal acceptance of the gas turbine by the airline industry. The Avon-powered Comet became the first turbojet to enter transatlantic service and in 1960, the Conway engine in the Boeing 707 became the first turbofan to enter airline service.

1959
The other major manufacturers in Britain between the wars were Armstrong Siddeley, Blackburn, Bristol, de Havilland and Napier. The leader among these was Bristol which, in 1959, merged with the motor car and aero-engine maker Armstrong Siddeley. Three other smaller engine companies were absorbed into Bristol Siddeley and Rolls-Royce in 1961. Finally, the capability of the British aero-engine industry was consolidated when Rolls-Royce and Bristol Siddeley merged in 1966.