Episode 5 is up next with the remarkable guest-list of Tim Minchin & Alexei Sayle (the only two guests in the whole series whose names combine to form an anagram of Ill In A Sexy Time Machine).
Here's a preview clip:
There'll be some extras - clips we couldn't squeeze into the show etc. - on the Genius website - as soon as the show is finished and no doubt a few others going up during the week.
It's on at 10pm. On BBC2. On Monday.