checklist for when you go to Trading Standards tomorrow make sure you do the following
1) tell them its a safety issue as in the car can and will move by itself
2) If you have any of it on finance / credit card etc take that with you as they will require that
i presume you've changed nothing on the car itself as this will null your right to reject the car. Also its within the 6 month period you have to reject the car under saftey grounds
Hope that helps
(missus works for Trading Standards

)