After the war Mann & Overton decided that it needed a more up to date design. So it was agreed that Austin would supply the engine/chassis with the body been supplied by Carbodies in Coventry, although the body was actually designed by Austin's chief body designer Jim Stanfield. In 1948 a new Austin Taxi appeared on the streets called the FX3, it was soon the market leader. Although in 1952 a diesel engine from Ferguson was available as a conversion, it was 1954 that Austin were producing their own 2.2 litre diesel engine as a factory fit. Also produced was the FL1 this was the same model but had no luggage space by the driver instead it had a bench seat and the roof sign was deleted.

Years of production 1948-1958
Total produced - 13737 (all chassis produced at Longbridge)
2-door body type taxi
RWD (rear-wheel drive), manual 4-speed gearbox
Engine: Gasoline
Displacement - 2199 cc
Engine power - 50 hp at 3500 rev / min
Maximum torque - 102 lbs / m at 1600 rev / min
Forced version (Hire Car) - 68 hp at 3800 rev / min, maximum torque - 116 lbs / 1,700 m / min
The diesel version - 2178 cc, 55 hp at 3500 rev / min, maximum torque - 89 lbs / m at 2800 rev / min
Length - 14 feet 5.3ins
Width - 5 feet 7.5ins
Height - 5 feet 10.8ins
Wheelbase - 9 feet 2.7ins
Front track - 4 ft 8 ins
back - 4ft 8ins
weight: 1448 kg / 3192 lbs