I'm starting in November in Peterborough if that is any help. There are a few people up there. I haven't used any of them personally (as I haven't started yet) but am happy to pass on the details via pm if you like?
I did mine in Peterborough with Apex - they are fantastic, and the trailer they supplied was far better than using my own (they have tape marking parts of it so that when you do thinks like hitching up and reversing etc you can line up marks with your vehicle/parts of the test course etc). I think they are quite pricey (not sure, work paid) but I highly recommend.
I used Tom Woods from C-Way training when i took my test a few weeks ago. He was brilliant both my boyfriend and i passed first time http://www.c-way.co.uk/trailer.htm
I used T & C Training, a couple of my friends have also. We all passed first time. They were great and horsey! www.trailerandcaravantraining.co.uk 07743 328450