Career
On retirement from her career as a magistrate (Justice of the Peace) she became the Lord Lieutenant of Cornwall and since then as a trustee of Cornwall Rural Community Council, the South West Lakes Trust, the National Maritime Museum, Falmouth and the TR14ers Community Dance Team Team based in Camborne. Lady Mary served as Commissioner for Street John Ambulance Cornwall from 1982 until 1987, being awarded DStJ (1987). In addition to this she is a Governor of University College Falmouth, Vice President for Exeter Charity, Street Loye"s Foundation and President of Cornwall County Scout Council She is also Patron of the Citizens Advice Bureau Cornwall.
On 8 August 1959, Lady Mary married Geoffrey Jermyn Holborow and they have two children, Katherine Mary (born 1961) and Crispin (born 1963).