Bern,
While accepting that whinging about rubbish forecasts isn't going to change anything, is it not somewhat surprising that despite the the massively improved tools available to the Met Office, and accepting the UK's particular climatological vagaries, forecasts for a few days hence appear not to be a great deal more accurate than they were twenty years ago?
Anything more than next 24 hours should have a large disclaimer stating "This forecast might be be a load of bollox - or it might not be . . . . "