Best gloves I've ever had have been Roeckl. I have a pair of Goretex which are good when it's really cold and 2 pairs of Windstopper. Don't know if you can get them in UK though.
Can also recommend Grip Grab, which is a Danish brand, made for Danish conditions. If anyone wants some - shout up.
On longer rides I normally take 2 pairs and keep one pair under my jersey for when the pair I'm wearing starts to get cold - inevitable after a couple of hours. It's a trick I learned when I was a bike messenger in Copenhagen during a very cold winter.