Queen's Balmoral test saw Princess Diana pass but Margaret Thatcher and Cherie Blair fail
The Crown.Episode four of the hit drama’s latest season – which launches next month – is titled The Balmoral Test.The “test” is the name given to the royal scrutiny guests to the Queen’s Aberdeenshire home believe they are under when invited to join her on her annual break at Balmoral.Former royal butler Grant Harrold worked for the Royal Family for seven years and met many guests of the Queen.Grant, 42, who grew up in Airdrie and has worked for Prince Charles, Camilla, Prince William, Kate and Prince Harry, said: “Balmoral, like Sandringham, is the Queen’s private family home.“If she invites you to Balmoral, then you are being invited to spend time with the Royal Family in a personal setting.