Does that include the venerable skyvan?
Yes, in spades!
The penultimate and last Sturgeons were rebuilt in 1949 as prototypes for the S.B.3, a proposed anti-submarine aircraft to M.6/49, powered by two Armstrong Siddeley Mamba AS Ma3 turboprops of 1,147 shaft horsepower (855 kW) driving two four-bladed propellers. The engine exhausts were directed downwards instead of to the rear. Another major modification was the grafting on of a gigantic bulbous nose that housed two radar operators in stations forward of the engines and the radar itself, below. Acute problems arising from the modifications led to the demise of the project, namely, "the efflux from the Mamba turboprops seriously destabilized the aircraft at some power settings and destroyed the good handling characteristics. It proved impossible to trim for safe flight on one engine which was a necessity for long endurance on anti-submarine patrols.