As it's been so long since you asked this shortly after midnight I assume you have already logged out.
Next time you log in, make sure it's to https://www.ebay.co.uk/
If you have any fears that you logged into a bogus site last night, change your eBay password.
NEVER follow any link provided to log in to eBay, or to any other site. This is how people get directed to bogus sites.