So the hold was sorted and then it came back after a couple of days. I just tried to add the Visa debit card again following Ebay's info. Ebay's system added the card and then dumped me to a generic "We Cannot Find That Page" error and then I was suddenly in Ebay USA's part of the website.

Pretty sure the issue is something to do with Ebay's systems, rather than my card or bank. This is very similar to the issues I had last year.

Oh well... Time to phone Ebay again and sit on hold.