I have noticed that my Witch-hazel is only just coming into flower now. Some years it's been over by now. I think they hang back as if they know worse weather is to come.
I'm in the same trade as you Jethro, it's very, very weird atm, and the amounts of pests and diseases around this winter, is phenomenal.
Only last week we had an entire bed of ornamental brassicas ravaged by cabbage white butterfly caterpillars, and they were swarming!
More slugs and snails than ever, more botrytis and blackspot. It's horrible, I'm praying for frost!