A one-off Christmas special must have the following traditional ingredients to be entitled to the name. First and most vitally, it must have a grumpy character to soften over the hour. (And it must be an hour – 75 minutes, tops. Anything longer and we’re out of letting-the-children-stay-up-and-watch-as-a-treat territory and that disqualifies it as a contender. Yes it’s a hangover from the days when television was broadcast at fixed points, instead of thrown into the digital ragbag to be pulled out at any time, but what is tradition if not such harkings-back? Come on).
Second, there must be snow. I know the planet is burning now, but please see above re tradition and harkings-back.
