Doing practical in London or Midlands?

it should not make a difference where you learn to drive or pass your test. if you are ready to pass your test you will pass.

Not really. It's like having two guys of equal physical ability running an obstacle course - one runs it distraction free, the other runs it with people poking him all the way through. The former is going to have an easier time and do better - the same applies to easier test routes vs notoriously complicated and trafficky ones like central London, which as a competent and pretty experienced driver I'd say is going to be difficult for a learner.

So yeah OP, I'd say make things easier on yourself and learn at uni, of course people pass in London but with all the nutters, traffic and a million lanes isn't ideally something to be dealing with while you're learning to drive.