And he has said he intends to return to what he describes as a more rigorous an O-level style qualification, promising more details later in the autumn.

BBC: Gove admits GCSE pupils treated unfairly in grades row

However, the historical accuracy of the book is undeniable, whether the subject is Spain's 16th-century landscape, fertility treatments of the period or the legal and business details that the author, who studied law and business, so convincingly describes.

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