In 1926, Brunner married Elizabeth Irving, an actress, the granddaughter of Sir Henry Irving. In 1937 they bought Greys Court in Oxfordshire, and donated the house to the National Trust in 1969 but continued to live there.
Brunner followed in a family tradition by standing for election for the Liberal Party: in Hulme in 1924, Chippenham in 1929, and Northwich in 1945, but was never elected to Parliament. He was elected to Henley Rural District Council, and served as its chairman from 1954 to 1957. He was also President of the Liberal Party in 1962/3.
Brunner was also a supporter of the Open Spaces Society, chairing it from 1958 to 1970.
Brunner's children include John Henry Kilian, now the fourth baronet, and Hugo, a former Lord-Lieutenant of Oxfordshire.
- Cathcart, Helen (1971). The Duchess of Kent (First ed.). London: W.H. Allen.
- "BRUNNER, Sir Felix (John Morgan)", Who Was Who
- Shirley Anglesey, "Brunner, (Dorothea) Elizabeth, Lady Brunner (1904–2003)", Oxford Dictionary of National Biography, online edn, Oxford University Press, Jan 2007; online edn, Jan 2009 accessed 3 March 2010
|Party political offices|
| President of the Liberal Party
|Baronetage of the United Kingdom|
of Druids Cross, Lancashire
John Henry Kilian Brunner