I didn't actually hear this on the radio but it was also in The Sunday Times.
I must admit, when I first read it I did laugh. How ironic, (I thought smugly) that an undoubtedly very intelligent, well regarded expert failed to get top marks in an exam deemed unsuitable preparation for study by Cambridge University, and other top Unis. (In the paper I think it said he took a theatre studies exam as well).
However I do admit that they have a point. In the article, the wife of the man who took the exam said that her friend had, at A level, taken a French exam and instead of finishing the final essay, wrote a letter to the examiner (in good French) explaining why she thought it was a silly question, and got an A. I don't think anyone in my year (just about to get A2 results) would have dared to do that kind of thing in their exams; nowadays, we know that we have to stick to what the examiner wants to hear.
However, I don't think this crushes originality. I didn't do English A level, but I remember at GCSE we were constantly being told to come up with original responses to literature essays: not deviating from the question, but just answering in a way that others wouldn't.
I was one of the few people in my English class who actually read all of our set texts, but many did just as well as me, and indeed better, without having done this. You could interpret this to mean that exams are learning objective-obsessive, or just that these students focused on the areas that were required of them (e.g., we read Kes and one of the topics was going to be on family, and there were 3 or 4 scenes which would provide the best basis for answering the question). I suppose what I'm trying to say (in a roundabout and waffly way, sorry!) is that knowing the whole of the text, or, in the case of the experts, knowing how to direct a play, and the best way to please an audience with one (amongst other things) would necessarily help with some of the questions asked of them.
I didin't see their exam scripts, so don't know how true this is, but could it be possible that they included too much of their expertise and failed to really answer the question? I know that 'answering the question' is the whole point of this debate - should originality and knowledge of the texts should come first? - but at the end of the day that was the question set for them and, if they didn't really answer it, or failed to answer it in a succinct manner, maybe they didn't really deserve some of the marks. I did science A2 subjects myself, but I did do History AS, and (as I'm sure you can tell by my post here) I found being precise and to the point with my answers one of the most challenging things about the exam. I found I would often include irrelevant information into my answers, and, though it was (probably) historically accurate, it probably wasn't worth marks. (Again, I didn't hear the show, and no script was given in the article, so they may have given direct, to the point answers).
Finally, didn't they only sit one A level exam question? I'm sure there are many A level students who got one 'mid-B' answer on one essay in their entire A level, and still went on to get an A. Not many A level students get full marks in every paper, and, though many tend to lose points equally over their papers, there's always a subject area that people do worse on.