mC - I missed the last series somehow (this is series 3 isn't it?). Anyway I watched the one on Saturday and it was pretty good (mainly 'cos the dragon's got out of that stupid cave) so I expect I'll start watching again
Morganna's back with a vengeance and a big sister (Emelia Fox is brilliant as Morgause - Queen of Air and Darkness in classic Arthurian legend) and consequently King Uther is in big doo-doo with Merlin, Gaius and Guinevere getting progressively suspicious and Arthur predictably clueless about Morganna...
and there I'll stop in case of really big spoilers