The new Javelin, not yet in full production, made its first public appearance on Saturday 27 July 1946 in a cavalcade to celebrate 60 years of the British Motor Industry organised by the SMMT.

[6] In a 1949 road test report The Times' correspondent welcomed the Javelin's good performance and original design.

The moderate size of the engine, the car's light weight and good streamlining all contribute to its excellent performance.

[7] The flat four overhead valve engine of 1486 cc with a compression ratio of 7.2:1 was water-cooled and had an aluminium block and wet cylinder liners.

[8] Even though Jowett had some experience in transmission manufacturing, the project went disastrously wrong; powertrainless bodies stacked up in the assembly line because of problems in gearbox production.

[9] Design features included aerodynamic styling with the headlights faired into the wings and, for the time, a steeply sloped, curved windscreen, a first for a British production car.

The "standard" car was simplified, retaining the metal dashboard from the PA series and basic vinyl seats were introduced.