I've watched all five episodes to date, many of them online, as I've often forgotten that they've been on.
I have to say, I'm thoroughly disappointed. Apart from the awards episode two weeks ago (rightly pointed out by Nicola), it's been mediocre comedy at best, living off the success and genius of the first season.
Last week's episode (Sir Ian McKellen) was purely shameful. Cringeworthy excuse for comedy that didn't warrant BBC's airtime. I've filed this under BBC blunders,as I feel it is one.
