John, a theater production sounds familiar! But I can't place where I heard about it.

There was a documentary on the BBC in 1974. From Musikfolk:

"In late 1974, [Fairport] re-recorded the tracks from the album plus incidental music for a BBC2 documentary narrated by Melvyn Bragg about John Lee. One of the most interesting aspects of this was hearing Sandy Denny singing the lead in a version of " Breakfast In Mayfair" . The programme was broadcast in the BBC2 " 2nd House" Series as " The Man They Couldn't Hang - John Lee" on 1st February 1975 and was due to be re-broadcast in " 2nd House 2nd Run" on 21 June 1975. However due to coverage of the Cricket World Cup Final over-running it was cancelled..."