From memory ( no documents to hand) I seem to recall that the original intention to order 10 Belfasts was considered a nonsense at Shorts who would only proceed on a minimum of 30 or so. This was duly agreed . Once the production line was committed then the order was then once more cut back to 10.
Originally called the Britannic ( Brit wing ) then Belfast once the aircraft had grown with the 20ft centre-section implant.
Hispano licence built Tynes went into Transall and Atlantique amongst others.
Only flew in one once ( "Hercules") coming home from Gernany post 1969 King Rock ( Beags!) - slept through the landing. Flight deck like the bridge of the Queen Mary.