Yo-Yo - thats a very common problem, the mechanic often doesn't set the steering wheel dead centre before making the adjustments. Your alignment is fine you just have to put up with driving with a steering wheel not sitting straight. Took me about 5 different workshops before I found a guy that would do it properly first time every time.
NizmoMan - No helmet hire.
Dave: Scrutineering will be 8-9am, driver briefing at 9am upstairs then start after that (last time it was about 10am, hopefully its quicker this time). Just get there at 7:30am to give yourself plenty of time to prepare your car so that soon as the driver briefing is finished all you have to do is put your helmet on and strap yourself in.