Don't worry for a bit. They probably will contact you. You could email them asking them to contact you within 12 hours to arrange delivery (take it you're not going to post the car ). alternatively you could request their details from ebay and phone them up to ask how they want to proceed with payment and delivery. (The protocols etc are different in this auction because of the nature of the auction - ie in that its a car- so i don't think that 'normal' rules apply)