It was not accepted for further consideration; the most valued submissions being from Armstrong Whitworth and Fairey, however the F.155 requirement was dropped as a result of the 1957 Defence White Paper.

[1] The Type 559 was an unorthodox canard design with a massive chin air intake, split vertically, for two reheated de Havilland Gyron engines of 20,000 pounds-force (89 kN) thrust each, placed one above the other, similar to the English Electric Lightning.

Two de Havilland Spectre Junior rockets were situated, one each side of the fuselage at wing level.

Two Red Hebe or Blue Jay missiles were mounted alongside the upper part of the fuselage between the canard and the mainplane, which had endplates incorporating twin rudders.

[citation needed] Data from Supermarine Aircraft since 1914 [2]General characteristics Performance Armament