Why oh why do 'celebrities' get involved in specialist subjects far beyond their understanding? For the money of course, but why should a television company commission a 'celeb' instead of somebody who really knows his stuff? Do they really think nobody will watch unless a recognisable 'name' is tied to it? Then again, it is the BBC and we pay for the entire bloated broadcasting empire.
Because, for the most part, experts, as exemplified by the many pedants who frequent these parts, are quite simply boring, blinkered, unintelligent tw@ts.