Really sorry to hear about this, biff, it's an awful feeling. They really need a good hiding. My bike got nicked from my yard last year, felt so annoyed with myself for leaving it there (albeit for only a few minutes). Called police, they didn't even come, just gave me a crime number. A few weeks later, was walking the dog and found my bike in the freakin' river - knackered of course. I was upset.