In reply to Phil1919:
yeah, you could fit a tracking device. The police still wouldn't do anything about it. I had 2 stolen at university, from the main concourse, right under CCTV. The police didn't even look at the CCTV, they just gave me a crime reference number to go to my insurance with. I'm sure bike theft must cost the UK an absolute fortune. Bike theifs know they are totally safe.
If my bike was stolen with a tracking device on it, I wouldn't follow it up myself. And the police still wouldn't do anything about it.
I am generally a big fan of our police, I think we do have a great police service in this country, but they don't give two hoots about bikes theft!!!