..... The A400M is simply a modernised version of the Short Belfast. I wonder if Short ever proposed a mk2 version? .....
According to "Jane's All the World's Aircraft" (1964-65 edition, pages 160-161) .....
Four versions of the SC.5 are offered currently, as follows:--
SC.5/10. Initial version, powered by four 5,730 ehp Rolls-Royce Tyne RTy.12 turboprops and with "beaver-tail" rear-loading doors. Design started in february 1959. Construction of first SC.5/10 began in October 1959 and this aircraft flew for the first time on January 5, 1964. Second SC.5/10 flew on May 1, 1964. These aircraft form part of an order for 10 for RAF Transport Command and have the sevice name Belfast C.Mk 1.
SC.5/10A. Commercial counterpart of SC.5/10, to carry wide variety of payloads, including freight pallets, large vehicles or 147 passengers in typical seating arrangement. Major differences compared with military model are deletion of some military radio/navigation equipment, automatic landing system, flight refuelling equipment and auxiliary power unit. The air-conditioning delivery system is semplified. The weight saved by these changes increases the capacity payload to 85,000 lb (38,555 kg), which could be carried 700 miles (1,125 km) with SBAC fuel reserves. More than 50,000 lb (22,680 kg) could be carried 3,000 miles (4,825 km) with similar reserves.
An "air-bus" variant of the SC.5/10A has been entered for BEA's design study competition for this class of aircraft. With two decks, 288 passengers could be carried six-abreast in four separate cabins, each with its own entrance and carry-on luggage facilities. This version would be able to operate from 6,000 ft (1,825 m) runways on stages of up to 900 miles (1,450 km).
SC.5/13. This version offers a substantial improvement in payload-range performance as a result of limited modifications which can be applied retrospectively to the SC.5/10. The most important changes are the use of larger (18 ft 0 in = 5.50 m diameter) propellers to improve field performance, an increased max T-O weight of 250,000 lb (113,400 kg) to permit more fuel to be carried for a given payload, and the introduction of fuel tanks in the wings centre-section to increase fuel capacity from 80,720 lb (36,614 kg) to 96,000 lb (43,545 kg). Max payload is 75,000 lb (34,020 kg):
A maritime patrol version of the SC5/13 has been proposed, with a weapon bay replacing the rear ramp.
SC.5/41. Projected jet development of SC.5/10, with basically similar fuselage married to a new wing based on that of the Lockheed C-141AStarLifter and powered by four Rolls-Royce RB.178 by-pass turbojets in underwing pods. Swing-nose loading. New tail unit with tailplane mounted at tip of fin. Max T-O weight of 420,000 lb (190.500 kg). Payload: civil 123,000 lb (55,800 kg), military 119,000 lb (54,000 kg). Cruising speed over 500 mph (800 kmh).