 These engines were installed in the Gloster Meteor F Mk1 and early F Mk3's and entered service in 1944.After initial suggestions in 1939 by the Engine Department of the Royal Aircraft Establishment (RAE), the latter's Pyestock Section experimented with the technique of injecting fuel into the engine's exhaust nozzle, later known as reheat, and this technique was further refined after Power Jets and the personnel from Pyestock had been amalgamated.Reheat was later flight trialled in the W.2/700 engines in a Meteor I.