The Parliament elected in December 1918 which sat from 1919 until 1922, represents the most significant deviation from the principle that the leader of the opposition is the leader of the party not in government with the greatest numerical support in the House of Commons. The largest opposition party (disregarding Sinn Féin, whose MPs did not take their seats at Westminster), was the Labour Party which had wholly left the Lloyd George coalition and won 57 seats at the general election. Thirty six Liberals had been elected without coalition support however were mixed in their opposition to Lloyd George. The Labour Party did not have a leader until 1922. The Parliamentary Labour Party annually elected a chairman, but the party, due to its congressional origins, refused to assert a claim that the chairman was the leader of the opposition. Although the issue of who was entitled to be leader of the opposition was never formally resolved, in practice the Opposition Liberal leader performed most of the parliamentary functions associated with the office.