This might jog your memory Bus429
XM496 was one of a batch ordered by the Royal Air Force Transport Command. Delivered in 1960, she was given the name Regulus, and saw service with 99 and 511 Squadrons. In 1975 she was withdrawn from use, and sold on the civil market. Registered as G-BDUP in March 1976 she served with Afrek Cargo, based at Athens airport. In 1984 she went to Cuban airline Aerocaribbean as CU-T120. After that she saw service in Southern Africa with Transair Cargo firstly as 9Q-CJH then as EL-WXA, becoming the last airworthy Britannia in the world.