when you go to the log out screen to enter your results below the green box bottom left is cancel test,press it,a list of reasons will appear,incorrect vehicle details is bottom of the list.if what you mean is youve already entered it and the test has been completed only dvsa can take it off the record then,ring em and prepare for a reaming,shouldnt be terminal but they have tried to do people for fraudulent testing cos of it so be careful
