As the "Alternate Andover" is supposed to be a "minimum changes" version of the Atlantic Airframe, basically removal of the unpressurised lower bubble, addition of a Ramp door in the rear fuselage and a few more windows, it will retain the RR Tynes, (so it will have plenty of power for "Hot and high" etc) thus retaining much in common with the RAF Atlantic MR 1, which would of course give savings in spare parts ,maintenance etc. Just for comparison I've found the General statistics for the Andover and the Atlantic;

General characteristics; **Andover**

* Crew: 2-3

* Capacity: 44 troops or 14,000 lb (6,350 kg) of cargo

* Length: 78 ft (23.77 m)

* Wingspan: 98 ft 6 in (30.02 m)

* Height: 30 ft 1 in (9.15 m)

* Wing area: 811 ft² (75.4 m²)

* Empty weight: 25,524 lb (11,577 kg)

* Loaded weight: 40,000 lb (18,000 kg)

* Max takeoff weight: 51,000 lb (23,100 kg)

* Powerplant: 2× Rolls-Royce Dart 12 Mk 201 turboprop, 3,245 shp (2,420 kW) each

Performance

* Maximum speed: 320 mph (512 km/h)

* Range: 1,624 miles (2,613 km)

* Service ceiling: 25,000 ft (7,600 m)

General characteristics; **Atlantic MR 1**

* Crew: 12

* Capacity: 12 passengers or relief crew

* Length: 31.62 m (103 ft 9 in)

* Wingspan: 37.42 m (122 ft 9¼ in [16])

* Height: 10.89 m (35 ft 8¾ in)

* Wing area: 120.34 m² (1,295.3 sq ft)

* Empty weight: 25,700 kg (56,659 lb)

* Loaded weight: 45,000 kg (99,200 lb)

* Max takeoff weight: 46,200 kg (101,850 lb)

* Powerplant: 2× Rolls-Royce Tyne RTy.20 Mk 21 2-shaft turboprops, 6,100 ehp (4,549 kW) each

Performance

* Maximum speed: 648 km/h (350 knots, 402 mph)

* Cruise speed: 315 km/h (170 knots, 195 mph) (patrol speed)

* Stall speed: 167 km/h (90 knots, 104 mph) flaps down

* Ferry range: 9,075 km (4,900 nmi, 5,635 mi)

* Endurance: 18 hours

* Service ceiling: 9,145 m (30,000 ft)

* Rate of climb: 14.7 m/s (2,900 ft/min) at 30,000 kg (66,140 lb)