"Truthiness" in The Queen

Rating: 10/10 (29 October 2006)

I thoroughly enjoyed this movie, and applauded the depiction of a leader who truly leads, in the sense of listening to others but in the end making up her own mind. It appeared to be a realistic depiction of a leader whose heart is in the right place--particularly in light of her "training"--but also one who is able to listen to the people and flex when she is certain of what her role should be vis a vis them. Cudos to Stephen Frears for not portraying her as a stereotypical woman.
My question is related to the degree to which the movie was based on fact. How many of the key interactions were made up versus being factual? For instance, were the lines of Tony Blair's wife and Prince Philip's totally made up or at least based on reliable information about their viewpoints?