St John lived at the ancient home of the St John family at Fonmon Castle.
Fonmon is still a private residence and the present owners, the Boothby baronets, are descendants of Colonel Philip Jones, who bought the house in 1656.
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In 2009, the club added a further two fixtures to its successful Fonmon Castle polo day: a charity polo day at the Legge-Bourke estate, Glanusk Park in July and beach polo at Swansea Bay, in collaboration with society fixer Arwel Richards.