The "Valetta T.3" was built to provide a navigational trainer for service with the RAF College at RAF Cranwell and with No.1 and No.2 Air Navigation Schools. They could be visually distinguished from prior variants by the presence of numerous astrodomes across the top of its fuselage. 40 aircraft were delivered from August 1951, with the last being WJ487 in September 1952. A total of 18 Valetta T.3s were subsequently converted to the "T.4" standard, which featured an enlarged nose that accommodate a radar unit, enabling the model to be used for the training of personnel in the Airborne Interception (AI) role.