aerofoil,
I'd suggest you stick with Derby unless you are planning on doing all your flying in the US. A very experienced pilot once told me that it makes sense to learn where you intend to fly most, so I went along with it and having flown in a number of places (including the US) I'm very glad I did. The UK is very challenging in comparison. You do hear stories of the three-weekers struggling when they return to Blighty. Besides, Derby has some nice short runways which keep your landing skills sharp. Flying into and out of big airports is more expensive than the small clubs, but I'm sure that if you booked a double lesson, then your instructor would be more than happy to take to you East Mids for that $100 burger.