The museum has a wide range of ex-military helicopters on display. In addition to what you will see here is the nose section of a Chinook [!] and a helo that was formerly used to transport the Queen. Very very nice!
Anyway, here are a few examples for you:
Westland Whirlwind HAR10... "Whirlwind" - what an appropriate name for a helicopter! :-)
Westland/ Aerospatiale Gazelle
Westland Belvedere HC1