Bike Fit in Aylesbury / Wycombe / Oxford area

I've been gettig problems with a sore hamstring after recent rides, so am thinking a proper bike fit might be the answer. Anyone know where I can get one in the Aylesbury / Wycombe / Oxford areas?
http://app.strava.com/athletes/287459
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http://www.twenty3c.co.uk/
Also there's Velomotion in MK, but it's a bit pricey.
BTW, the only bike shop that I know of still in Wycombe is Cycle Care, but there's nowt about fitting on their web site. The big shop on Oxford Rd (I don't recall its name) closed a few years ago.
Member of http://www.UKnetrunner.co.UK - the greatest online affiliated running club
I'm less enthused than Jane about AW. I had a fitting there prior to buying a bike off them, which was OK (but I've changed the stem since, the one they supplied feels too long to me) but if you try talking to them about your measurements afterwards, they seem to focus on selling you another bike (both myself and my son have independently had the same experience) or you paying more money - they tell me it costs them £50 every time they use their software ...
This one has opened in High Wcombe quite recently
http://www.freewheelin-bikes.co.uk/index.html
Owned by Andy Clarke, a very serious road rider in his day. You'd get good advice in there.
http://100hillsforgeorge.blogspot.com/
http://www.12on12in12.blogspot.co.uk/
(That's not to say that I believe the other suggested people would be unable to help - thanks for all your suggestions).
Member of http://www.UKnetrunner.co.UK - the greatest online affiliated running club