It is not yet known whether the Duke and Duchess of Sussex will stay on as patrons of the charities and organisations they represent.
The letter is in “open solidarity” to Meghan's recent “very frustrating and extremely costly experience” with the UK media.
The Duchess is on a six-week break from royal duties and is in the US with Prince Harry and Baby Archie.
“I was a bit disappointed that Harry and Meghan have decided not to spend Christmas with the Queen this year."
The female members of the Royal Family each have very recognisable seated positions. A royal etiquette expert explains how they're achieved.