Repair and maintenance services of aircraft engines. Requirement for an enabling contract to provide, separately, both a supply of aircraft engine spares and a spares inclusive repair and overhaul service to the BBMF for Rolls Royce Merlin and Griffon engines. The repair and overhaul element of the contract will be spares inclusive and includes the bay maintenance of associated engine components, with an estimated feed-in rate of two aircraft annually. The supply of spares will be in addition to those required for the repair and overhaul and will be supplied on an as required basis.