Phantom FG Mk 1 = F-4K.
Phantom FGR Mk 2 = F-4M.
74 Sqn = F-4J(UK).
Numerous components were built in the UK, including rear fuselage sections, fins, rudders, tailcones, stabilators, wing leading edges, brakes, INS, radar (Ferranti) etc - but all aircraft were built by MD in St Louis, who called them F-4s.