I couldn't let this "Miles" thread pass without a plug for the Berkshire Museum of Aviation
http://www.museumofberkshireaviation.co.uk/, located on what was a corner of Woodley Aerodrome. It's run by a smashing bunch of enthusiastic and knowledgeble people. A great way to while away a rainy afternoon - no shortage of those at the moment!!
Never been in a Gemini but scrounged a few flights in Messenger G-AKKC when I was lad; that was pretty wonderful.