Known as Marshall's Flying Schools Ltd. until 1962, becoming Marshall of Cambridge (Engineering) Ltd., developed major engineering, overhaul, and conversion organization at Cambridge. During 1958-1960 produced much-modified AusterT.7 designated Marshall MA.4, a boundary layer research aircraft built under Ministry of Aviation contract for Cambridge University. Undertook the lengthening of 29 RAF Hercules transports as C.Mk 3s up to 1985, plus conversion of other RAF Hercules C.Mk 1s into flight refuelling tankers, and conversion of ex-airline TriStars into tankers for the RAF. Known as Marshall of Cambridge Aerospace Ltd. since 1992. Offers design, modification, maintenance, support, and specialist manufacturing for aircraft, while other programs include association with Lockheed Martin of the U.S.A. on the RAF/British Army's proposed airborne stand-off radar (ASTOR) proposals using a modified Gulfstream V as the core platform.