The African Bush Daisy (Euryops chrysanthemoides) in the front garden can be relied upon to flower profusely as winter approaches- and flowers in spring too in fact. Seems to be entirely hardy in London though it's a long way from its native habitat of Southern Africa.

 On a bright but chilly day it was attracting pollinators. I've never seen a bee on it but a variety of flies are drawn to E. chrysanthemoides.