Royal author Tom Bower claimed the Duke and Duchess of Sussex wanted to appear alongside the Queen on Buckingham Palace's balcony during the celebrations. According to the biographer, Harry "asked the Queen’s resistant advisers" and when this "failed" he visited the monarch en route to the Invictus Games in The Hague in April.

However, Mr Bower said the issue of the Sussexes stepping out on the Palace's balcony "remained unresolved". Writing in Revenge: Meghan, Harry and the War Between the Windsors, he said: "The danger of allowing the meeting surfaced six days later."

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