who presides over the session of house of lords
House of Lords The Lord Speaker may be replaced as presiding officer by one of his or her deputies. The Chairman of Committees, the Principal Deputy Chairman of Committees, and several Chairmen are all deputies to the Lord Speaker, and are all appointed by the House of Lords itself at the beginning of each session. By custom, the Crown appoints each Chairman, Principal Deputy Chairman and Deputy Chairman to the additional office of Deputy Speaker of the House of Lords.[69] There was previously no legal requirement that the Lord Chancellor or a Deputy Speaker be a member of the House of Lords (though the same has long been customary).