IF YOUR BUYING AND IT COULD MAYBE BE DODGY LIKE ITS TOO CHEEP etc you can show a hp i as proof you bought legit if it goes tits up. i have contacted the old bill before now to check the car i was buying was ok as it was from a salvage yard ( universal salvage now copart) and the rs turbo had a new id in the floor and a old id on the slam panel, the car came back ok and cleared by the copper who checked for me, not a lot of people know you can ask the plod to check cars like that