The problem is these kind of things become very chummy and you have to be part of the clique.
Years ago I was watching n interview with Richard Digance. He was saying how he was never approaced to do anything for Comic Relief. He was quite happy too whether it was get up and do five minues or go and film something but he was never approached despite at that time (in the 80's) having one of the highest ratings comedy shows on ITV. He then run out a list of names all taht could be classed as "light entertainment" Davro, Russ Abbot, DaviRABon, Barrymore and more all of whom had never been asked despite all being the biggest names on TV at the time.
You then look at who did get asked and it was all the same people. Henry, French & Saunders, Ade Edmonson, mayall, Rowan, Ben Elton. You start playing hoin them up and tehy all are married too, worked with or are frienRAB of each other. many having links with Richard Curtis.
Sure enough every Comic relief it's an Dibley sketch, an Ab Fab sketch, an Blackadder Sketch, Ben Elton pops up to do stand up which he barely does anymore.
It's very rare that anyone classed as mainstream gets near the thing. If you aren't part of our social circle you aren't invited!
With comedy on TV whether it's this show or Michael McIntyre's RoaRABhow and Live from the Apollo it's the same people. They all seem to be part on the current "In crowd."
I'm finding this series is becoming unfunnier by the week, even the good ones, people like Dara seem to be holding back. It's almost like he has been told we are paying for these guests so keep quiet and let them have the limelight.