Really sorry to hear that AKVAI. This sort of thing worries me every time I park up Zed and actually stops me using my car to go places alot of the time,which is pointless.
What I end up doing is taking my girlfriends car (luckily she understands )which is not such a worry, but the exact same thing happened to that car in Tesco Gatwick. I returned to the car to see the rear bumber was hanging down slightly and scored paint.
I went in to ask about cameras, but was told there are none.
I feel for you mate. The B★$t@£d$