I think when the weather's like that the bees are very sensibly hiding. The bumble bees all die off in the autumn and just the queen lives through the winter, although of course it's different with honey bees. It would/will be a problem when the weather suddenly goes back to it's normal dreichness and cold, leaving any bees out and about to die. We had a cold snap with snow earlier, and I haven't seen any bees here since then
I'm sure snowdrops are fine - I bought loads in the green last spring, once the flowers had died down, and I'm looking forward to a good display. They love crocuses too, but of course they are out a bit later on. I've see no mention of bees liking aconites, but I grow them anyway as they're bright and cheerful.
The main winter plants are apparently mahonia and that pink, sweet smelling shrub which flowers in winter but has no leaves (is that wintersweet?) and ivy - which doubles up as shelter. There's something else I mentioned upthread, but I've forgotten it.