I have HPi'd it and it comes up as a 130 defender registered in 1995. New owner has only had it since 6th September 2012. Interestingly, it is listed as Yellow and a 7 Speed Auto !
This has been parked up in the communal parking bit at the back of where I live for about 3 weeks now...it's never been there before, and it hasn't moved (I work days and nights and it hasn't moved) Usually I wouldn't jump to this conclusion but given how easy they are to nick, thought I'd double check...
That's what I'm going to do now, the other high probability now we think its not nicked is that it's broken somehow - so I'll offer help!