Wycombe Air Park is run by Airways Aero Associations Ltd part of which is the British Airways Flying Club who operate a fleet of Piper Warriors (and a Piper Dakota and a Chipmunk).
Have a look at:
http://www.bafc.co.uk/home.shtml
Certainly go and visit them before you make their mind up, meet the people (instructors aren't hour building persons, they're either career instructors or retired BA flight crew) and have a look at their aircraft.
It pays to look around before you dive in! Particularly check out any possible 'hidden' costs which one of the aforementioneds' parent companies is renowned for....