Member of Parliament (Unionist) for Hillhead 1948-82, Assistant Chief Whip 1950, Scottish Unionist Whip 1950-57, a Lord Commissioner of the Treasury 1951-54, Civil Lord of the Admiralty 1957-59, Joint Parliamentary Under-Secretary for Scotland 1959-62 and for Transport 1963-64, Opposition Transport Spokesman 1964-65, Vice-Chairman Commons Transport Committee 1966-69.