Amendment of notice of appeal
11.—(1)  The appellant may, with the permission of the Board, amend his notice of appeal.
(2)  Where the Board grants permission under paragraph (1), it may do so on such terms or conditions as it thinks fit to impose, and it shall give such further or consequential directions as it may consider necessary.
(3)  The Board shall not grant permission to amend a notice of appeal in order to add a new ground of appeal unless the Board is satisfied that —
(a)such ground is based on any matter of fact or law which came to light after the notice of appeal was lodged;
(b)it was not practicable to include such ground in the notice of appeal; or
(c)there are exceptional circumstances to do so.