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No its a text only email. And the eBay link appears to be genuine - when I open the link and enter made-up username and passwords it returns that they are not recognised.

Just a wild guess, but that could be a "man in the middle" attack - you are connected to a bad guy's site, who in real time connects to real eBay. I would forward the mail (with headers and everything) to eBay's abuse people.
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Dragi "Bonzi" Raos Q#5196 MkII #080000376, 18GB green MkIIa #040103247, 60GB blue