His ancestral family home is Blenheim Palace in Woodstock – Sir Winston’s birthplace – which is owned and managed by Blenheim Palace Heritage Foundation.
In a statement, the group said: “The foundation is unable to comment on the charges, which relate to the duke’s personal conduct and private life, and which are subject to live, criminal proceedings.
“The foundation is not owned or managed by the Duke of Marlborough, but by independent entities run by boards of trustees.”
The King hosted a reception at Blenheim Palace for European leaders in July 2024, and the Queen, then the Duchess of Cornwall, joined the duke for the unveiling of a bust of Sir Winston in the palace grounds in 2015.
The duke’s representatives have been approached for comment.
Additional reporting from the Press Association.