I found one of my bikes and rather than confront the person on it, I followed him home.
I called the Police, who sent an officer round to my house and took the details of the bike, the frame number, the description of the 'new rider' and the address he was seen entering.
This was over 10 years ago and I've still not heard anything from the cops.
If a £2000 car got nicked, the police would be all over it, but because it was a bike, they did f**k all.
Moral of this story? If you do ever see your bike, don't rely on the law to get it back, know what I mean?