Whilst annoying that a buyer may not communicate asap after an auction win for a collection item it is usual to wait 7 days although after 4 full days when lapsed you can cancel the order citing Buyer Has Not Paid.
This will refund you your seller fee for the car as you listed it in auction format, but the listing fee will have to be paid. As with all listing fees these are payable sale or no sale.
If you are unfortunate to have to list the car again, take a peek at listing it in a Classified ad format the listing fee is a little more expensive, but there are benefits, when the vehicle sells there are no seller fees to pay, and it stays listed for 30 days.
Here's all you need to know about Selling with classified ads: https://www.ebay.co.uk/help/selling/listings/listing-tips/selling-classified-ads?id=4167&st=12&pos=1...
@92ry92