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He said: “It is considered extremely unlikely that Jack Brooksbank will be granted a title by the Queen when he marries Eugenie in October.

“In the past these have also often been rejected, as with Angus Ogilvy who married Princess Alexandra and Mark Phillips who married Princess Anne.”

But Mr Fitzwilliams said he doubts Princess Eugenie, 27 will give up her title of HRH upon her marriage and will be known as either HRH Princess Eugenie, Mrs Brooksbank or just HRH Princess Eugenie.

As Eugenie is not a working royal - she and her sister are not included on the list of royals on the Queen’s website - the offer is not likely to be extended to their future spouses.