From the Guardian:
GCSE student penalised for too sophisticated answer

Staff and agencies
Tuesday July 4, 2006

Teachers have told a bright GCSE student she would have to dumb down in order to pass her exams, prompting concerns that examiners are unqualified to mark some papers.

Katie Merchant, 16, was marked down for giving a sophisticated answer in her mock Latin exam. She achieved an A* - the highest mark possible - but lost marks on one question because her answer was too sophisticated.

Teachers warned the girl she would be similarly penalised in the real exam, prompting her to express her disappointment in a letter to her Brighton college headteacher, Richard Cairns.

Speaking today, Mr Cairns said examiners often marked papers in subjects they knew little about and that he warned his pupils they would often know more about the subject than the marker.