It's complementary. It's fairly clear where the boundaries are. When I start telling you the contents of his head, I am making it up. But I try to make it up based on what is on the record. So even my wildest speculations [on Thomas Cromwell] will have a root somewhere.

It is all very well planning what you will do in six months, what you will do in a year, but it’s no good at all if you don’t have a plan for tomorrow.

Read Becoming a Writer by Dorothea Brande. Then do what it says, including the tasks you think are impossible. You will particularly hate the advice to write first thing in the morning, but if you can manage it, it might well be the best thing you ever do for yourself. This book is about becoming a writer from the inside out. Many later advice manuals derive from it. You don't ­really need any others, though if you want to boost your confidence, "how to" books seldom do any harm. You can kick-start a whole book with some little writing exercise.

I think psychologically [Margaret Thatcher] is really worth studying. I am reading Charles Moore's biography of her, and he has gotten us right there with a woman who lived the unexamined life, and lived it deliberately, and who has contempt for history, even her own.

He is careful to deny responsibility for September, but he does not, you notice, condemn the killings. He also refrains from killing words, sparing Roland and Buzot, as if they were beneath his notice. August 10 was illegal, he says; so too was the taking of the Bastille. What account can we take of that, in revolution? It is the nature of revolutions to break laws. We are not justices of the peace; we are legislators to a new world.

My first book was a historical novel. I started writing in 1974. In those days, historical novels meant ladies with swelling bosoms on the cover. Basically, it meant historical romance. It was not respectable as a genre.

We have a number of very powerful women in the world now - Mrs. [Angela] Merkel, who the Germans call Mutti. What did we call Mrs. [Margaret] Thatcher? When she was minister of education, she stopped the children's free school milk. This may sound quaint, but after the war we were such a malnourished nation that part of the founding of the welfare state were public health initiatives. Every little schoolchild got milk. Mrs. Thatcher stopped it. They called her "Maggie Thatcher, milk snatcher."