OK guys. I saw the Sky 2D broadcast of this a couple of days ago. Obviously it wasn't the whole show as most of the featured artists were only shown performing one or two songs, apart from Queen (well Brian May and Roger Taylor) who effectively played the final half hour of the broadcast.
Guy Fletcher could clearly be seen in the house band backing Alison Moyet ("Feelin' Good"), Phil Collins ("You Can't Hurry Love" and "My Girl"), Mike and the Mechanics ("Over My Shoulder") and Paloma Faith ("Smoke and Mirrors" and "New York").
Other performers featured were Status Quo ("Rockin' all Over the World"), Jools Holland with Tom Jones ("Burning Hell" and "Glory of Love") and Eric Clapton ("Queen of Spades" and "Crossroads"). As far as I could see these performances did not involve Guy.
During the Queen set, Guy featured on piano during "It's a Hard Life" (incredible vocal performance by Tom Chaplin of Keane) and was quite visible during the "We Will Rock You" finale.
If you are interested, the Queen segment of the concert, which also included "Days of Our Lives" (vocals Roger Taylor), "Lost Horizon" (Brian May instrumental) and "Seven Seas of Rye" (vocals Midge Ure), is on YouTube
Wishing everyone a safe, successful and happy 2011.