Bury lived most of her life at Mount Stewart, both before and after her divorce. Her father had a strained relationship with Bury's brother, his only son, which led to Bury and her mother inheriting the Mount Stewart estate after the 7th Marquess of Londonderry's death in 1949. Bury was a keen gardener, maintaining the gardens created by her mother. The gardens were given to the
National Trust in 1957 to ensure their survival. Bury stayed on the estate, living in an apartment after she gave the house and most of the contents in 1976 to the trust. She generally avoided contact with the thousands of visitors who came to the estate. Bury served as a Justice of the Peace in County Down, but was a stanch opponent of the
Good Friday Agreement. She broke with family tradition and left the
Ulster Unionist Party to join the
Democratic Unionist Party, as she felt it was the only way that the interests of Northern Ireland could be guaranteed. Bury was the life president of Ards Football Club and served as commodore of Newtownards Sailing Club. She was also a racehorse owner, owning the first thoroughbred stud in Northern Ireland. With her horse
Fighting Charlie, she won the
Gold Cup at
Ascot twice, and with
Northern Gleam the Irish Thousand Guineas once. At the Royal Ulster Agricultural Society's show at
Balmoral, Belfast, Bury regularly exhibited yearlings and colts. ==Philately==