(1)The High Court of Appeal for Ireland shall be constituted of the following ex-officio judges, that is to say, the Lord Chancellor of Ireland, who shall be president of the court, the Lord Chief Justice of Southern Ireland and the Lord Chief Justice of Northern Ireland and of such other judges as may from time to time be nominated as members thereof in manner hereinafter provided.
(2)The High Court of Appeal for Ireland, when hearing any appeal, shall consist of. three judges sitting together, of whom one shall be the Lord Chancellor of Ireland, another shall be the Lord Chief Justice of Southern Ireland, or a judge of the Supreme Court of Southern Ireland nominated by him to act in his place, and the third shall be the Lord Chief Justice of Northern Ireland, or a judge of the Supreme Court of Northern Ireland nominated by him to act in his place:
Provided that—
(a)if the Lord Chancellor considers that the case is of such importance that it is advisable that the court should consist of five judges, it shall consist of such three judges as aforesaid, together with an additional judge of the Supreme Court of Southern Ireland, nominated by the Lord Chief Justice of Southern Ireland, and an additional judge of the Supreme Court of Northern Ireland, nominated by the Lord Chief Justice of Northern Ireland ;
(b)if the Lord Chancellor is unable to sit, the court shall consist of four judges, namely, the Lord Chief Justice of Southern Ireland, or a judge of the Supreme Court of Southern Ireland nominated by him, the Lord . Chief Justice of Northern Ireland, or a judge of the Supreme Court of Northern Ireland nominated by him, a judge of the Supreme Court of Southern Ireland nominated by the Lord Chief Justice of Southern Ireland, and a judge of the Supreme Court of Northern Ireland nominated by the Lord Chief Justice of Northern Ireland.
(3)The High Court of Appeal for Ireland when hearing an appeal from the Supreme Court of Southern Ireland shall sit in Southern Ireland, and when hearing an appeal from the Supreme Court of Northern Ireland shall sit in Northern Ireland; and if the Lord Chancellor is not sitting, the Lord Chief Justice of the court within whose jurisdiction the High Court of Appeal is sitting, shall, if he sits as a judge of that court, preside; subject as aforesaid, judges of the Supreme Court of Southern Ireland and of Northern Ireland holding corresponding offices shall, when sitting as judges of the High Court of Appeal for Ireland, rank according to the priority of their respective appointments.
(4)No judge shall sit as a judge of the High Court of Appeal for Ireland on the hearing of ah appeal from any judgment or order made in a cause or matter heard by himself either sitting alone or with other judges, or from a judgment or order reversing, varying, or affirming a judgment or order so made.
(5)There shall be attached to the High Court of Appeal for Ireland such officers as the Lord Chancellor, with the approval of the Joint Exchequer Board as to number, may appoint, and there shall be paid to such officers out of moneys provided by the Parliament of the United Kingdom such salaries and allowances as the Joint Exchequer Board may determine, and there shall be paid out of moneys so provided to every judge of the said court such allowances as may be determined by the said Board in respect of attendances at the sittings of the court when it sits in a part of Ireland in which he does not reside.