Prince Harry begins work on mystery project at London studio

A letter issued on the King’s behalf on Monday states the Duke and Duchess of Sussex are still bound by the terms agreed when they stepped down from royal duties in 2020. They are "no longer working Members of The Royal Family" and do not represent the sovereign at public appearances.

The letter was sent to Harry’s team, government departments, military officials and Lord Lieutenants, according to Palace sources cited by the BBC.

It also makes clear that Harry and Meghan should not use their HRH styles, which remain in abeyance.