According to the BBC, and other sources, the funeral for HRH The Duchess of Kent will be held on September 16, 2025 at Westminster Cathedral.
https://www.bbc.com/news/articles/c1mx9vzmjy3o
The duchess was Catholic, and there will be a Requiem Mass for her funeral. This will be the first royal Catholic funeral in the UK in modern times.
There will be a private family service, followed by burial at Frogmore, in Windsor.
The most senior members of the Royal Family will attend, led by the King and Queen.
Brooke