A year or two back there was an episode of Question Time with "Brian Cox" on the discussion panel, but when screened, this turned out to Brian-the-Scottish-Actor-Cox, rather than Brian-the-Rock-n-Roll-Physicist-Cox.
Well, since Brian-the-Scottish-Actor-Cox seemed an unusual choice (with nothing to promote etc), and Brian-the-Rock-n-Roll-Physicist-Cox is one of the Beeb's favourite flavours, there seemed like more than a suspicion that a booker for the programme, told to see if "Brian Cox" was available, reached for Spotlight (or whatever they use these days), and booked the wrong one ...
If true I'd have like to have heard the conversation behind the scenes as the guests arrived
To be fair, Brian-the-Scottish-Actor-Cox was really rather good, and as I recall, did a nice job of deflating David-the-Snobby-Historian-Starkey.