Really sorry to see your damage, Ozzbi. From the pictures, it looks as if the rear quarter panel isn't damaged, so a new bumper and light cluster should have it looking good as new. Small consolation, I know, but at least you caught the offender in the act.
Slightly off topic but on the parking theme commented on by others in this thread; I
hate parking in a public car park, and always try and park away from others. Why is it when I park 'miles' away from everyone else, will someone almost always insist on parking right next to my car - usually really close - when there are loads of other spaces they could choose. I also hate airport car parks, having suffered damage to my previous Golf in one a couple of years ago.