"We was just looking at your car mister" when challenged form the window, then they scarpered, went and checked, my valve caps are gone (All of 99p) and the front tyre was flat.
Begs the question, why? I understand the nicking of the valve caps, they are shiney and they have boring black ones, but why let the tyre down? Don't give a toss about the valve caps, but not impressed at the tyre. In hindsight I should have left it and not shouted at them then I wouldn't be worried about it, but I couldn't just ignore it. (also I thought they were after the centre caps)
Called the local cop station for advice as it lives on the drive all day long. Apparently if they come back I can photograph anything else they do for evidence. Just worried that they will be back with some tools and I'll be accused of anything improper for photographing the little buggers....

Replaced with the boring black ones off my bike and the Porsche now.
Anyone used locking valve caps?
Rich