Found out this morning from the police that the caravan isn't stolen but has been recovered from the people who turned up at my door.
The caravan at the moment is mine under the eyes of the law, but they have told me not to sell it or move it while they investigate further.
From the little bits of information I got, it sounds like they didn't pay some bills and beliefs removed some items under a court order.
Seems like they are unhappy with this and decided to try and get their van back.
I have been told that I will have more information later as things unfold.