I used BSM--partially because they had an office that I walked by ALL the time, so it was easy to pop in and check them out and partially because I noticed that, out of the millions of driving instructors around Manchester, the cars were always well cared for and the students weren't pulled over to the side of the road in tears (something I DID see a few times on my walks to work!
).
I was really pleased. I lucked out with an excellent instructor, but, if I hadn't, there were a LOT of other people to choose from and switching would be dead-easy. It's been a bit more expensive, but I don't mind paying a bit more to feel safe and comfortable.