HO were most unhelpful. Just said if I wanted to reject the car then they couldn't get involved. It was just between me and the dealer to sort out. Got legal advice and they said it was v difficult to get a refund. The contract is pretty watertight. They said the best way to go about things would be keep sending it back again and again until they can't fix it then they'll have to do
something. Or the other thing to do would be to sue them for delivery of a product that doesn't meet the description and/or for stress caused, phone calls, loss of earnings etc. See what happens over the next few days.