Education
He was educated at Ackworth School, Yorkshire, and University College, London.
He was educated at Ackworth School, Yorkshire, and University College, London.
He was Study Group Secretary at the Royal Institute of Internal Affairs, 1934–1936. He joined the Dominions Office in 1936, and became Private Secretary to the Parliamentary Under-Secretary in 1939. Snelling was Deputy High Commissioner for the United Kingdom in New Zealand, 1947–1950, and South Africa, May 1953–January 1956.
He was Assistant Under-Secretary of State at the Commonwealth Relations Office, 1956–1959, and British High Commissioner in Ghana, 1959–1961.
Snelling was Deputy Under-Secretary of State at the Foreign and Commonwealth Office, 1961–1969, and Ambassador to South Africa, 1970–1973. He was Vice-President of the United Kingdom-South Africa Trade Association, 1974–1980.
Amongst friends and family he preferred the name Peter, using his birth name for public affairs and correspondence. He had suffered from, and been treated for, lung cancer but died of emphysema on 25 June 1996 at his home in Kingston upon Thames.