If the code is not in your email, you eBay messages or sent to spam, then contact eBay Customer Services tomorrow as the lines are closed now, and they will provide this code for you.
Scroll to the very bottom of the page on the link below you will be able to access eBay Customer Services through the Contact Us link.
https://www.ebay.co.uk/help/buying/search-tips/advanced-search?id=4049&query=1455&st=GENERAL_SEARCH
Lines open between 8 a.m. and 10p.m. on weekdays, and between 9.am. and 6 p.m. on weekends.
@jjase1976