Some really great responses here, thanks all for taking the time to answer and sorry I've not been around much to check all the replies. My dad's been in hospital since the weekend and been spending most of my time running around. Anyway I've got a bike training class in a couple of weeks and am in two minds whether to take my bike with me or use the school's one. If I take it then maybe the instructor could check it over with a professional eye and help tweak things (I never knew you can move the seat around on the rails). Then again he or she might say it's not road-worthy and cancel the class lol.