A Speaker ceases to hold that office if, for any reason, they cease to be a member of the House. There is no convention in Australia that the Speaker should not be opposed in their seat, and three Speakers have been defeated at general elections: Littleton Groom (1929), Walter Nairn (1943) and William Aston (1972). Because the Speaker is always the nominee of the governing party, there is no expectation that a Speaker will continue in office following a change of government. While the Opposition usually nominates one of its own members for Speaker after a general election, this is understood to be a symbolic act, and party discipline is always followed in any ballot.