This Westland Wessex HC.2 was on display at RAF Cosford. The HC.2 was a RAF Troop carrier for up to 16 troops, the prototype was converted from an HAS1 and an additional 73 were built.
The Westland Wessex is a British-built turbine-powered development of the Sikorsky H-34. It was developed and produced under licence by Westland Aircraft (later Westland Helicopters). One of the main changes from Sikorsky’s H-34 was the replacement of the piston-engine powerplant with a turboshaft engine. Early models were powered by a single Napier Gazelle engine, while later builds used a pair of de Havilland Gnome engines.
I didn’t realise that the last RAF Wessex helicopters (Cyprus based HC Mk 2s) retired as late as 2003.
I always had this idea of Westland Wessex helicopters flying about for games set in my world of the Second English Civil War or Team Yankee. For 20mm games there are plenty of choices, both kits and diecast models. For 15mm Italeri do a 1/100th scale Wessex die cast kit which would work well.
For larger 28mm scales, you are probably looking for the 1/48th Revell plastic kit.