Henry, Lord Porchester, born Henry George Reginald Molyneux Herbert is portrayed by Joseph Kloska. He was the Queen's childhood friend and her racing manager. Know as "Porchey", he was heir to the title Duke of Carnarvon, using the courtesy title Lord Porchester.

As a young man, Porchey took the Princess Elizabeth to balls and parties, and was part of the group who joined the crowds on VE Day, as dramatized in the film A Royal Night Out.