Robert Lacey is quoted in this Express article about Kate Middleton and The Queen and how they prepare for State Visits.
“Another aspect of her visit to Quebec was, of course, her mastery of French,” British historian and biographer Robert Lacey (who has worked as a historian on Netflix award-winning drama The Crown) said in Channel 4 documentary The Windsors: Secrets of the Royal Tours.
“The fact that French people tell me she speaks French like a Frenchwoman.”
Read the full article: https://www.express.co.uk/travel/articles/1256543/kate-middleton-travel-duchess-of-cambridge-royal-family-foreign-languages