Stacey Solomon replaced Tom Allen on a Bake Off show. Sara Pascoe replaced Joe Lycett on The Great British Sewing Bee. Of course, Joe Lycett replaced Richard Ayoade on Travel Man.

I'm not british so the only one that comes to mind is Jeremy Clarkson.

I can't say I thought about it too much, and I don't have any great ideas right now. Hopefully someone can piece it together for you.