Locks that work

When I returned to it about 2am, after failing to get through the Pitlocks, they nicked the saddle anyway (easily the lowest value item on there, it was a beater a shop gave me for free while they were replacing my real saddle) and dismantled the front of the stem, leaving my drops just hanging down on the front on their brake cables.

[...]

this time when they couldn't do anything, they too kicked in the front wheel (which is why rhowe's post prompted me to post) beyond usability. Fucking fucks.

It's a pisser, isn't it? Report it to the police - they'll give you a reference and hopefully it will help them to realise how much of this shit goes on. If they don't know about it they can't do anything to deal with it (even if they know about it that's no guarantee, of course...)