I was on Question Time, the 9/11 10 year anniversary special episode. Just in the audience though, not on the panel. If you freeze frame the beginning bit, you can see me briefly. Also in distant audience shots at other points.
I was also on BBC1 during the Federer v Sergey match at Wimbledon this year. Again in the audience (it counts!). You can see me twice, once at the end after Sergey won the match and is celebrating. I am about 1cm tall on screen. Again, you would have to freeze frame it on iplayer to see.