Behold, the Short Knuckleduster.

It was powered by a pair of Rolls-Royce Goshawk 12-cylinder engines that used evaporative cooling. From Wiki:

The Goshawk was developed from the Kestrel IV prototype engine, to use evaporative (also known as “steam”) cooling. Rather than keep the cooling liquid below its boiling point in the cooling system, the coolant was allowed to boil; the phase change from liquid to vapour takes more heat from the engine, so less coolant is needed. However, instead of a radiator to take the heat from the coolant, a condensor was required to turn the vapour back to liquid. This had to be much larger than a radiator and added drag to the aircraft design.

Which explains those bishop mitres on top of the engines. Only one was ever built.