Is it your great car or that compressor?
Both have successfully sold, so I would suggest contacting eBay Customer Services explaining the item has sold, and can they unblock your message block to this buyer, as you need to forward now, contact details for collection.
Lines are open now until 6 p.m.
To Contact Customer Services it's a Live Chat, or you can select to speak and request a Call Back. Click on this link:
https://www.ebay.co.uk/help/eua?id=5275&mkevt=1&mkpid
On the left sidebar you can see Have us Call you or Chat with Our Automated Assistant.
On weekdays lines open between 8 a.m. and 10 .m.
On weekends they open between 9 a.m. and 6 p.m.