To see if there is any information about a van being reported stolen on the UK police national computer, all you need to do is....
https://www.caranalytics.co.uk/van-check

Enter the registration number to find out number plate details. Our free number plate check contains over 20 fields of data about the vehicle, including....
https://www.caranalytics.co.uk/guides/how-to-find-the-owner-of-a-car-by-license-plate-number-in-the-uk/