B+E towing test

[ozywoods]

Hi
I'm thinking about taking my towing test so that I can to large trailers (eg car transporters). I believe that I would need to take the test to be able to do this as towing approx 2.5 tons (possibly more) would probably go over the gross train weight limit for a normal car licence.
Anyway, does anyone know anything about the towing test? I believe is costs around £100 (probably gone up since I last looked though), and you need to have a suitable vehicle and box trailer with which to take the test ( I have the terrano to do the towing and access to a suitable trailer).
I have some experience with maneuvering trailers, I usually do ok, but would obviously need to practice.
However I don't really know what the test would entail, I assume it would involve some maneuvers and some general driving, does anyone know? Also any general tips on trailer towing and things to look out for or be aware of? And good maneuvers to practice?
Thanks