I only know this site http://62.20.67.28/trekronor/
But it's only in swedish and I don't know if they ship to England, but you could ask them. Click kontakt and write your message.
(namn=name, E-postadress=emailaddress, eget meddelande=your message) after that click Skicka.
I don't know about any game-worns.. didn't find any socks either :/