With reference to the "cut Kryptonite", the world has a problem. In the last year or two, cheap rechargeable angle grinders have appeared on eBay, imported from China. I lost the key to my u-lock last year, and had to take measures to get my tourer back. Turned out one of these grinders was about the same price as getting the locksmith out, and it would of course have a use for me in future, whereas the locksmith would go home to his family. Let me tell you it cut through my lock in about 30 seconds, and nobody said a word to me about it. Nothing will stop a thief who's prepared to shell out £50 to be equipped to do his job well.