50.—(1) The Board, in determining an appeal, may take into account matters other than those raised by the parties or by any person who has made submissions or observations to the Board in accordance with section 45, if the matters are matters to which, under section 61, it may have regard.

(2) The Board shall give notice in writing to each of the parties and to each of the persons who have made submissions or observations in relation to the appeal, of the matters it proposes to take into account under subsection (1) and shall indicate in the notice—

(a) in a case where it proposes to hold an oral hearing of the appeal or where an oral hearing of the appeal has been concluded and it considers it expedient to re-open the hearing, that submissions in relation to the matters may be made in writing to the person or persons conducting the hearing, or

(b) in a case where it does not propose to hold an oral hearing of the appeal or where an oral hearing of the appeal has been concluded and it does not consider it expedient to re-open the hearing, that submissions or observations in relation to the matters may be made in writing to the Board,

within a period specified in the notice, being not less than 14 or more than 28 days beginning on the date of service of the notice.

(3) Submissions or observations received by the Board after the expiration of the period specified in the notice referred to in subsection (2) shall not be considered by the Board.

(4) Without prejudice to section 46, where a party or a person referred to in subsection (1) makes submissions or observations to the Board in accordance with subsection (2), he or she shall not be entitled to elaborate in writing on those submissions or observations, or make further submissions or observations in writing in relation to the matters referred to in subsection (1), and any such elaboration or further submissions or observations shall not be considered by the Board.