The good people of Outdoorgearlab.com have put together a good article all about picking the best walking socks – they have also done the research. This is, of course, an American site so please bear in mind that British weather and hills are different, but the basic information is in my opinion sound.
If you fancy buying some British socks then take a look at the following manufacturers:
Altberg Socks – I’m also a big fan of their boots.
Bridgedale – a good choice used by many, including myself