I have received the following from Alan Conner (the blue italics are my additions):
“A quick heads-up to say that there’s a programme on BBC Two tomorrow (28/2/17 at 10pm) which I suspect will be of interest to all people 225. It’s a one-off episode of Inside No 9 (a 30 minute dark comedy): the lead character is a cryptic setter (Professor Squires) who is visited by a woman called Nina, and the whole thing is based around a puzzle. (Disclosure: I feature briefly and needlessly in the credits as “crossword consultant” or similar.)”