Winter gloves

Craft do a very good lobster glove.

GripGrab. I have a pair of their warmest waterproof ones and I rarely wear them as it's rarely cold enough, they do a lobster that is warmer still.
Whatever you buy don't buy them too tight as a bit of trapped warm air makes a big difference.

It's either pogies or down mitts.

I'm currently riding some discontinued Sealskins lobsters into the ground but have these lined up as replacements for longer rides.

https://www.pearlizumi.com/GB/en_GB/shop/unisex/gloves/road/pro_amfib_lobster_glove/p/14341508

I really suffer with cold hands and even have some pogies, which I used until I discovered a few important points that have allowed me to get away without them in most cases..

1) Lobster claws that don't have a liner separating your fingers seem preferable to me as they allow the fingers to heat each other and retain that heat better (full mittens are even better in this respect but obviously that's a bit more of a pain with braking).

2) Buying a size larger than you would normally gives you a bigger pocket of warm air to exploit (I was forced into this to accommodate a plaster cast a few years ago and was amazed by the improvement - for both hands, not just the plaster casted one!

3) Resist the temptation to stuff this extra space with liner gloves - the warm air space is more beneficial than extra material IMO.

4) If the wind is getting in, some gorilla tape will help (I discovered this by creating a 'solid thumb' with tape for scraping snow/ice off snowboards and noticing how toasty that was in comparison to the other one)

I once had to ride home with a sock over my hand when I lost a glove on a freezing night. The fact that it was too big, and allowed my fingers to touch each other, resulted in that hand being warmer than the other (which had an expensive winter glove on it) which was something of a revelation..