Hi Henwood
Not that familiar with either Dunstable or Booker, but the key difference between the two is that Dunstable offers both winch and aerotow launch facilities whereas Booker is to my knowledge aerotow only (winch cables are not happy bed-fellows with busy power airfields). So Dunstable will be cheaper when you're learning the circuit bashing and landing, as you're not forking out for an aerotow launch every time. That said, students who learn exclusively on aerotow tend to solo after fewer launches than those who learn via winch, as you get more stick time early in your training and you don't have to learn and practice all the winch launch failure scenarios. And both sites have interesting airspace constraints, so if you can cope with that at those sites you will never be intimidated by complex airspace at other sites. As for drinking, wot rich said. You can drink and fly, but you have to do them in the right order....