best thing I've found is a pair of silk glove liners from decathlon skiwear for about £6  plus whatever normal winter gloves you wear, Last winter no matter which pair of previously useless winter gloves I put on over the top of these liners, they seem to have stopped my fingers feeling numb in the cold and rain.

They seem to wick the sweat away from the main glove and stop the resulting moisture getting chilled by the wind.

I've got a pair of Specialized Submerge gloves, which are excellent.  The older ones had an unsecured lining which was pants, but the new ones are a massive improvement.

At this time of year you need something which keeps out moisture too IMHO.