Hello, find out that there are two Royal Air Force Museums in United Kingdom:
Royal Air Force Museum Cosford
Helicopters: Bristol Sycamore HR.14, Focke Achgelis FA330, Sikorsky MH-53M Pave Low IV, Westland Dragonfly HR.3, Westland Wessex HC.2
https://www.rafmuseum.org.uk/cosford/
Royal Air Force Museum London
Helicopters: Robinson R22, Westland Wessex HCC4, Westland Sea King HAR3, EHI EH-101 Heliliner, Aerospatiale (Westland) SA-341E Gazelle HCC Mk.4, Bristol 171 Sycamore HR.12, Sikorsky R-4, Bristol Belvedere XG474, Boeing-Vertol CH-47D, Sikorsky Hoverfly Mk.1
https://www.rafmuseum.org.uk/london/
Listed. Thank you for the information! Have a nice day!