It's a bad fit for a worse reason.
Jo Whiley is dreadful, that breathless cod-student enthusiasm - you're in your mid-forties woman, act your age!
I quite like Simon Mayo, I can't believe he is happy having this foisted on him, but as a professional, he will make all the right noises.
I had serious reservations about Cerys Mathews taking over Paul Jones' Blues Show, but I have interviewed her at length about it, and she is not a 'token insert', she is a committed and knowledgeable blues fan, so I take back what I said about her in this context.
But as for the 'Simon And Jo Show', it's really not good, not good at all.