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As the King marks his 75th birthday, David Yelland and Simon Lewis look at how the Palace is using artificial intelligence to track public sentiment, what series six of The Crown means for the Royal PR strategy, and the thorny issue of Prince Harry’s court crusade.

Also in this episode – Shell’s drive to change how 18 to 24 year olds feel about fossil fuels.

And Pharrell Williams' million-dollar handbag for Louis Vuitton – why it is good PR to make people jealous and mad as hell?

Producer: Eve Streeter
Editor: Sarah Teasdale
Executive Producer: William Miller
Researcher: Sophie Smith
Music by Eclectic Sounds
A Raconteur production for ´óÏó´«Ã½ Radio 4