I have done the Hotfoot Boots, nice and warm, but impossible to walk in. Hiking boots with water-proof socks, very good to walk in, but if you get your feet wet they get cold unless you are walking about. But then I saw Chris Bishops Wychwood boots, ?39.95 and built like a Panzer Tank. Needless to say after a day sitting next to him going on about his nice warm feet I went down the Tackle Box and got a pair.
After many hours of testing in the lounge and back yard I can safely say that the are warm, very warm. A good pair of boots.