This was a matinee show in aid of the NSPCC and there were number of celebrities in the audience. However, the only one I saw was Chrissy Hynde who I walked past on the way to the loo!
Another item of note was the performance by Bad News (Comic Strip spoof band) which included a spot where their guitar solos were actually being played by Jimmy Page and Brian May who appeared from behind the speaker stacks.