Well worth watching on Britbox. I signed up for the free trial just to watch it as I am a big fan of murder mysteries and Lesley Manville and Tim McMullen. From Anthony Horowitch's novel (he wrote Foyle's War).
Great to see Navid from Still Game playing two very different characters, too.
All the other letters were crossed out with the character saying the remaining letters formed the worst word in the English language if that is what you are referring to