Coming to it seriously peeved with Dr Who for the way in which the last episodes did not clear up a host of anachronisms and rubbish in the 2015 series, and discussing somewhere else the use of "it was all a dream" by Masefield in "A Box of Delights" (a technique I banned in story writing at school, back in the days when we did story writing before it was banned for being too girly), I was actually not too disappointed by the use of the imaginary world, especially the way it was left open at the end that the present was a dream from the past. I rather liked it.

But I am still seriously peeved with them over Dr Who. All they needed to do with it was to suggest that the Time Lords had been interfering with things, either through a dream state or a holodeck type experience from at least the Vikings onwards, for exactly the same purpose as the confession dial rubbish - 4 1/2 billion years, and Ashildr survives without the piece of kit going wrong at all. Or going mad. And then he gets over Clara so fast and has the real thing with River Song.

The big difference between Sherlock and Who is, of course, that they don't have to invent characters or plots from scratch for Sherlock, even if they then tinker with them.