The chaps at Beverley always seem nice when I'm there, Sandtoft is maybe a bit far for you and again Ray Price seems a top bloke, failing that there is sherburn in elmet where I fly from is spot on too, Ive never had any instruction at Beverley or Sandtoft but I can vouch for the instructors at Sherbs, well the two I had during my training anyway! Why not have a drive around them all one day and chat to the CFI? See how you feel in the atmosphere as they all seem different. You want to feel at ease as you will be spending a few bob there.
Cheers, Jim