A question I've seen thrown around quite a bit is "Who's the most famous Brit that only Brit's know?" and it really made me think
Because you've got people like TV Presenters Ant & Dec but with the reach of Britain's Got talent bringing in many international contestants each year, I think we can rule them out.
Another interesting one I see thrown out is Claudia Winkleman but I think she's a similar case to Ant & Dec with how big The Traitors has gotten.
I think a safe answer for us Brits is someone like the Chuckle Brothers or Holly Willoughby is one that's always been on my mind for this question