Treffry retired to his ancestral home of
Place in
Fowey in 1987, where he played a conspicuous part in Cornish public life, becoming
High Sheriff in 1991, president of the
Royal Institution of Cornwall in 1993, and oversaw the inauguration in 1994 by the Queen and the Duke of Edinburgh of the
Royal Cornwall Museum. He also worked for the Cornwall region of the
National Trust, and other local organizations. He was a friend of the Cornish historian and poet
A. L. Rowse, and, on Rowse's death, became the legatee of a substantial sum – which he made over to the Royal Institution of Cornwall, the National Trust, and the
Cornwall Heritage Trust. In 1997 he was diagnosed with a terminal illness, but continued to play an active rôle in Cornish public and social life until his death at
Truro in 2000. ==References==