The Duke and Duchess of Cambridge will visit Canada and the west coast of the US this week, in a "historic trip" that will be of "substantial benefit" to Britain.

Amanda Foreman, US-based author of Georgiana: Duchess of Devonshire, and Richard Fitzwilliams, former editor of International Who's Who and royal commentator in the UK, talk about the "huge reaction" in the US to their "approachable glamour".

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