SACEUR
SACEUR bombs were American W28 designs 'Anglicised' as Red Snow deployed from 1962 to 1972 under the NATO nuclear weapons sharing program and possibly as warheads for Blue Steel again in '62. This makes sense because you're not going to take a W28 and attach it to a Canberra a Valiant or Blue Steel and expect it to work. Looks like the lead in was 3-4 years from the 1958 agreement.