 The chassis components were based on those of the Comet tank, although with only four road wheels rather than the Comet's five.The prototype was completed and tested on the firing ranges of Kirkcudbright Training Area.This was only a boilerplate example; it was unarmoured and the armour layout design had not been completed and the body of relatively high and vertical plates is unlikely to have been the shape or the material used for a final example.