Derby is very short and it will take you longer to get your PPL for that reason.
I once posed that as a question to somebody closely involved with Derby, and surprisingly enough, the figures, on average, are no different from anywhere else!
If you train at Derby, you'll be confident landing just about anywhere, apart perhaps from a 3 mile asphalt runway...
In fact, the only problem I ever encountered there was more to do with the A/G operator than the airfield itself.