For whatever reason when I watched this episode for the first time a decade ago I wasn't very impressed. My opinion has grown over that time, and it stands as a critical turning point for the Twelfth Doctor. I have not become a full Last Christmas die-hard but it's a tidy piece of work. It's a fantastic supporting cast headlined by Nick Frost as Santa Claus and Shona the companion that never was (who reads as a proto-Thirteenth Doctor now).

The theme that every Christmas is the last for somebody is something that's stuck with me more as the years have gone on. Capaldi and Coleman of course have fantastic chemistry, and it is genuinely thrilling to see them get a second chance together. Maybe we do need to make a Last Christmas reunion one of these years, because they've certainly all earned it.

A pivotal bridge between the Series 8 and Series 9 versions of the Twelfth Doctor, and always a comforting rewatch.