Ken Follett was interviewed for the NY Times and was asked the following question
Q. Is it hard, as an author, seeing your book being changed and condensed in the adaptation process?
A. It’s not really hard. You look at the actor, and you think, “Oh my God, he’s not supposed to look like that.” Matthew Macfadyen, for example — Prior Philip in my mind is a small, slight man. And his strength comes from the force of his moral courage. And Matthew Macfadyen is, what, 6 foot 5? And terribly handsome. So initially you think, “Matthew Macfadyen?” But you accept that. I don’t mind it at all. It amuses me.