Ever wondered where the inspiration for 'Whatever Happened to John?' came from?

A few years ago I saw a program called Snodgrass (Playhouse Presents) set in an alternate universe in which John Lennon had left the Beatles in 1962. Starring Ian Hart, written by David Quantick, directed by David Blair, produced by Michael Knowles. Watch 'Snodgrass' here: https://www.youtube.com/watch?v=Ek89aSrwMN0&t=187s