Thank you all for the replies I'll answer in sequence:
Ballcock,
I have found the information you mentioned, copied it and intened to try it this weekend, I'll keep you posted.
Sierrfery,
Thank you for the info. I'll check it out, maybe the same as that I've already found, but you can't have too much good info.
Snagger,
I agree with your thoughts on this entirely but I have been using this garage for several years (friend of my daughters) so I don't really want to get heavy handed or go down the legal route, however, I won't use them again. They certainly won't get any recommendations from me.
I have tried the child-lock button for my rear windows, no luck, I will investigate further.
I didn't know the steering had to be rotated from lock to lock. I will try this and also the 'paper clip' method suggested by ballcock
Thanks again,
Horseman