Image: King Charles and Queen Camilla were due to attend the funeral together. Pic: PA
But the Queen is hopeful she will recover in time to attend all royal elements of Mr Trump’s trip, which includes a lavish state banquet.
A Buckingham Palace spokesperson said: “With great regret, Her Majesty The Queen has withdrawn from attendance at this afternoon’s Requiem Mass for The Duchess of Kent as she is recovering from acute sinusitis.”
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The Duke of Kent has been informed and is said to fully understand the decision, wishing her a speedy recovery.
The Queen had travelled down from Scotland this morning and is currently travelling to Windsor, where she will rest.
“Her thoughts and prayers will be with The Duke of Kent and all the family.”
The requiem mass, which is a Catholic funeral, is the first to be held for a member of the monarchy in modern British history.
Royals in attendance included Prince William, Catherine, the Princess of Wales, the Princess Royal and her husband, Vice Admiral Sir Tim Laurence.
Image: Pics: PA
Prince Andrew and Sarah Ferguson, the Duchess of York, were also seen approaching Westminster Cathedral for the service.
Image: Pic: PA
Former Formula One world champion Sir Jackie Stewart and actresses Rula Lenska and Dame Maureen Lipman were also among the mourners.
Katharine, the Duchess of Kent, who became the oldest living member of the Royal Family when Queen Elizabeth II died in 2022, died at the age of 92 on 4 September.