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“The monarchy is not elected, so the only way in which a monarch can demonstrate consent is not through the ballot box, but through people turning out on the streets,” said Robert Lacey, the historical adviser on “The Crown? series. “And if the monarch turns up on the balcony and waves and there’s no one there, that’s a pretty definitive judgment on the monarchy.

"Well, when it comes to Elizabeth, the opposite has been the case. People can’t wait to mass and cheer together,” he added.

And the royals, sometimes criticized as out of touch with modern Britain, want to show that their support comes from all parts of a society that has become more multicultural amid immigration from the Caribbean, South Asia and Eastern Europe.

As part of the jubilee pageant, dancers from London's African-Caribbean community will don costumes of giant flamingos, zebras and giraffes to re-imagine the moment in 1952 when Princess Elizabeth learned she had become queen while visiting a game park in Kenya. Another group will recall the queen’s 1947 marriage to Prince Philip and celebrate weddings around the Commonwealth with Bollywood-style dancing.

The jubilee is an opportunity for the royals to demonstrate their commitment to change and diversity, something the queen has embodied as she traveled the world over the last 70 years, said Emily Nash, royal editor of HELLO! magazine.