F.155 specified exacting demands: The Ministry of Supply made clear in the requirement that the plane and missiles should be treated as a "weapon system" i.e., a cohesive whole.

The armament specifications were covered by a separate Operational Requirement, OR.1131, which listed two missile systems: the infra-red guided de Havilland "Blue Vesta" and the radar-guided Vickers "Red Hebe".

[1] Two detachable rocket boosters, to give a 3.7 minute boost, were carried in mid-wing nacelles.

The paper was a major review of military spending and one of its elements was the cancellation of nearly all manned fighter projects as a radical change had occurred in strategic threats with the expectation that intercontinental ballistic missiles and low-level strike would replace high flying bombers.

Data from Futile Rivals,[2] British secret projects : jet fighters since 1950[3]General characteristics Performance Armament Related development Aircraft of comparable role, configuration and era