I'm sure there is little harm in attending and one may learn something. However there are other courses out there which I hear are very good. Of the top of my head - flaps podcast done an article a while back about one such course but I can't remember the name of the guy who ran it
As far as the Met Office go - personally, I would like to see them give some decent forecasts before I start paying them to teach me how to read the weather. They rarely get forecasts correct in my neck of the woods 24 hours in advance!! (Always seeming to err on the crap wx side). One generally does a better job by looking at the 'raw' information and work out what the weather wants to do and when its likely to do it. Failing that, take about 4/5 different sources and take an average