Make sure your insurance is cancelled off the old van as well Daz, if they drove it away with no mot on it they are already showing there lack of care. The police now have a record so you will be ok. As a back up, call crimestoppers and record what has happened, any calls to crimestoppers HAVE to be acted on. They have to send a report in that 'supervision' will HAVE to act on,calls direct to your local police force dont.