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Experts say the future king should have a shorter coronation with a congregation of just 2,200 - in stark contrast to the Queen’s lavish three-hour affair attended by more than 8,000 people.

They argue the heir to the throne should make an “oath to the people” rather than three traditional promises to uphold Christianity in a bid to ditch “feudal” ties to the nation’s imperial past.

The report, by University College London’s Constitution Unit, called for the coronation to include a separate non-Christian ceremony at Westminster Hall.

The report writes: “The UK is no longer a major international power; but it still has an international monarchy, with the Queen being head of state of 15 other countries.