Lady Mary has been a resident of Hampshire for over fifty years. From 1994-2014 she was Lord-Lieutenant of Hampshire and was a patron or president of many local and national organisations.
Lady Mary is a Dame of the Order of St John, the first Chancellor of the University of Winchester and is High Steward of the City of Winchester. She was appointed a Dame Commander of the Royal Victorian Order in 2009, and a Companion of the Order of St Swithun in 2017. Last year Lady Mary was appointed to be a Lady Companion of the Most Noble Order of the Garter.