9(1)On an appeal before the Special Commissioners—
(a)the Board may be represented by any of its officers; and
(b)any party to the appeal may be represented by a barrister, solicitor or any accountant who has been admitted a member of an incorporated society of accountants or, with the leave of the Special Commissioners, by any other person.
(2)The Special Commissioners may at any time before the determination of an appeal give notice to any party to the proceedings other than the Board requiring him within the time specified in the notice—
(a)to deliver to them such particulars as they may require for the purpose of determining the appeal; and
(b)to make available for inspection by them, or by an officer of the Board, all such books, accounts or other documents in his possession or power as may be specified or described in the notice, being books, accounts or other documents which, in the opinion of the Special Commissioners, contain or may contain information relating to the subject matter of the proceedings;
and any officer of the Board may, at all reasonable times, inspect and take copies of, or extracts from, any particulars delivered under paragraph (a) above and the Commissioners or any officer of the Board may take copies of, or extracts from, any books, accounts or other documents made available for inspection under paragraph (b) above.
(3)The Special Commissioners may summon any person to appear before them and give evidence, and a witness before the Special Commissioners may be examined on oath.
(4)On an appeal before the Special Commissioners, the Special Commissioners may allow the appellant to put forward any ground of appeal not specified in the notice of appeal and may take it into consideration if satisfied that the omission was not wilful or unreasonable.
(5)The Special Commissioners shall on an appeal to them confirm the determination appealed against unless they are satisfied that the determination ought to be varied or quashed.