Hi Joe,
You could check out the below option-
https://
services(dot)amazon(dot)co(dot)uk
/services
/sell-online
/how-it-works.html
https://
www.
amazon(dot)co(dot)uk
/gp/help/customer
/display.html?nodeId=3149141
(For some reason this website is having some issue to post links so please replace (dot) with . and rearrange the above as 1 link)
Best wishes,
VJ