what aaroncast said is spot on

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also anyone can borrow trade plates, my mate borrows his to people he knows on the understanding if they get stopped its nothing to do with him,they are not allowed to borrow them only his employes that are insured to drive
depending if the punter is a fucking bell end i put the time and date on a invoice as it has been known for a new owner to try breaking the land speed record on the way home, i also had a van i sold get a parking ticket on the day i sold it to a plasterer,luckily i sent his details off on the form and heard no more,but he could of said it wasn't his and it was me who owned it at the time and that would of been tricky,not if the invoice is timed and dated though