Sir Peter Hordern served as Member of Parliament for Horsham from 1964 to 1974, for Horsham and Crawley from 1974 to 1983 and for Horsham once again from 1983 to 1997. He was appointed to the Privy Council of the United Kingdom in 1993. He was appointed a Deputy Lieutenant for West Sussex. He was a member of the Public Accounts Committee from 1970 to 1987, Chairman of the Finance Committee from 1970 to 1972 and Chairman of the Public Accounts Commission from 1988 to 1997. He was appointed to the Executive of the 1922 Committee in 1967, later becoming Secretary of the 1922 Committee and Chairman of the Conservative backbench Committee on Europe.