Hi,
I live in Bucks (just outside Aylesbury), but grew up cycling Naphill and Downley. I mainly ride around Wendover now (not at Aston Hill though). I'm up for meeting up for a ride if you fancy it.
There's a Chilterns ride which starts in Risborough in issue 14 of IM Bike mag that I fancy giving a go (it's somewhere in here -
http://www.imbikemag.com/issue14/?Cover)
Drop me a PM if you fancy it and we'll agree a date (likewise if anyone else fancies it, let me know and we'll start a meet thread).
J=