Error or mistake9.
(1)
If an agent alleges that a determination under paragraph 4 of Schedule 16A was excessive because of some error or mistake in a return made by him under paragraph 2 of that Schedule, he may by notice in writing at any time not later than six years after the end of the year of assessment 1989—90 make a claim to the Board for relief.
(2)
On receiving the claim the Board shall inquire into the matter and having regard to all the relevant circumstances of the case, but subject to paragraph (3), give by way of repayment or otherwise such relief in respect of the error or mistake as is reasonable and just.
(3)
No relief shall be given under this regulation in respect of an error or mistake as to the basis on which the syndicate profit or loss ought to have been computed where the return was in fact made on the basis or in accordance with the practice generally prevailing at the time when the return was made.
(4)
(5)
In this regulation “return” includes the documents referred to in paragraph 2(1)(b) and (c) of Schedule 16A.