There is usually a Britain based comic on the show alongside the actors/singers etc. I think if you were to look up most the the uk panel show regulars, you’d see that most of them have been on GN at one point or another promoting a book or tour. Rob Beckett, Jo Brand, Josh Widdecombe, Greg Davies, Sarah Millican, John Bishop etc etc. I’m sure she is not the only one who hasn’t been on but considering her show All That Glitters is BBC it is strange that there hasn’t been cross promotion there…
I don't find any of those people you mentioned funny in any way. Is there something wrong with me? Tell a lie, I found Jo Brand funny in the early 90s.