Guys,
A word of advice to all of you who have had your car damaged in a multi-storey and had the offender drive off...they are usually all covered by cameras and you are entitled to request access to the recordings.
I used to work in insurance fraud and had the local council on speed dial just for this. Got so many people paid out by tracing who had damaged their car. These cameras are not perfect but often better than you think and good enough to make out a reg number.
bear in mind you need to be fast as a lot of this stuff is wiped after 30 days. If you find damage to your car ina council car park, get round to the town hall asap and register it with your insurance company so they can put in a reuqest too. Better still report it to plod as criminal damage, give them the time and place, and they have to investiagte it (might not want to though!). Also remind them of the deadline.
I know what it's like - someone kneed the entire drivers side of my car leaving 10 deep dents, just out of spite. Cost me a bit to get it fixed and couldn't do anything about it.
If enough people complain to the councils, they might have to make the spaces big enough for a normal car, not a 1960's Mini!