If it's really cold (i.e. -5 and under) I use ski mittens and liners. I tried a couple of types of lobster gloves - and sorry I don't remember which brands - but found them a bit of a let down. IIRC it was more from shoddy and cheapo construction rather than the concept - so if there's some decent ones available in the UK nowadays, I'd be happy to give them a punt (if I wasn't already happy with the mittens). Either mittens or lobster gloves bork your motility and potentially shifting a bit, but less so than having frozen fingers that have lost all sensation so I'm happy to live with it.