A school administrator cannot search your car, or your bag, unless he has your permission (Although not letting him is basically admitting guilt). Off the school premises, if he searches your car, he is basically breaking and entering your vehicle. He would need to call the police for a warrant.
No, the reason that you may search on school grounds is because its private property. They can not search a students car off ground.
it really depends were you live but no i dont think its legal in the uk. try searching online at www.britishlaw.org
Have it towed?
You do.
Depends how long it has been there.
Yes, private property does not obsolve you of your responsiblity.
In the UK it can, if the driveway is private property.
The driver that hit the parked vehicle would be at fault.
The person who hit a parked vehicle is at fault.
yes
you are
Yes you can, as long as its not stolen.
if the vehicle is parked on private property and if there is a sign saying that vehicles will be towed away you can move them.
No it is not against the law. People have cars that they're not using or old cars that aren't in use anymore sitting in their yard. It does not break any law as long as it is parked on your property unless the vehicle is parked on public property.