I'm Sorry I'll Read That Again

Program: 25th Anniversary Show
Transmission Date: 25/12/1989

Cast:

John Cleese
Bill Oddie
Tim Brooke-Taylor
Graeme Garden
David Hatch
Jo Kendall
Sketch:
John & Mary's Anniversary
The Silly Walk - radio version
Song:
Spring
The Ferret Song
Prune Playhouse:
Jack The Ripper
Credits:
Script: Graeme Garden, Bill Oddie, Jo Kendall & Lizzie Lord
Song: Bill Oddie & John Cleese
Music: Dave Lee & the Boys
Produced by: Richard Wilcox

The show runs 60 minutes.Its main theme is the story of the BBC re-cycling used radio shows. The above sketches, etc. are a small part of the show.
I believe that this show has been slightly altered from the original broadcast, in which I recollect a long rant from David Hatch, terminating in "I AM THE PRINCE OF DARKNESS!". In this recording the line is delivered quietly, without the rant, and out of context !
Still David Hatch is an important BBC executive so there may have been reasons for the change ?
BBC Radio Collection