The convention is that you would give a present or "Christmas box" to somebody whose services you use regularly, particularly those that provide a personal, face to face, service. Taxi drivers and hairdressers are the usual, but milkmen back in the day also, not so much the people you only speak to on the telephone or businesses using other businesses, the builder is unlikely to bring the plumber a bunch of flowers for example, by those rules prossies, especially ones regularly seen, should be right up there for a gift of some description, although it's not a normal industry so make your own mind up it's personal choice, I wouldn't criticise anyone who did more than anyone who didn't, I think I'll only have one punt before Christmas, it is a girl I've seen before and we got on very well, but I won't be taking anything for her.
As a side note, I've only ever visited one WG who had a Christmas tree up, it must have been April time, she said she hadn't had the to take it down.
