Gutted to hear this Gary, had this happen to me b4 & its heat wrenching if you love your bike even 10% as much as I love mine - tread on my blue suede shoes but don't touch the bike under pain of death or worse
A few tips that may or may not be of use -
Is there anywhere local that kids take stolen bikes to ride? - Park/old railway lines etc, as you may catch them driving it, then its a simple case of waiting till they run it out of petrol, & seeing where they stash it overnight.
Is there anywhere local that bikes/cars get burned out & or stashed? as its well worth checking out.
Are there any travellers sites near you? as if so being a totally biased git I would wager a pound it will be there or close by
Do you think its kids or a "real" theft?.
What bike are we talking about anyway Gary? - road/enduro/custom??