OK. I think there is a happy medium between 'wow, they are waaaay too famous' and 'who??', though! Happy to be corrected !
I think we are probably overlooking some clues buried in the words. For example, in Hedgehog's , he said 'Who do you think you are?' which is a pretty obvious nod towards the telly programme but easy to miss. Davina picked up on the way he said 'are' like 'aria' but they , therefore, didn't focus on the clue to the TV prog , which Michael Ball has done. Not sure about Manford? That's where he also said 'tenner' as in 'tenor'. Hedgehog is dropping the most clues.
I did ponder for while whether he was Billy Idol , given he had a pic of Billy Connolly whilst using the word Idol... not sure any other clues quite match up though 