Finance Act 1981

5 (1) Where a participator has under paragraph 2 of Schedule 2 to the principal Act delivered to the Board a return for a chargeable period and the Board are satisfied that the information given in the return is correct in so far as it is material for the purpose of computing his gross profit (if any) for that period, the Board shall (in so far as the computation falls to be made by reference to the matters dealt with in the return) make the assessment or determination under paragraph 4 above in accordance with the return.

(2) Where the Board are not so satisfied in relation to a participator's return or a participator fails to deliver to the Board a return for a chargeable period as required by the said paragraph 2, the Board shall, in so far as the computation of his gross profit (if any) for that period falls to be made by reference to the matters which were dealt with in the return or, as the case may be, ought to have been dealt with in a return, make the assessment or determination under paragraph 4 above to the best of their judgment.

(3) Nothing in sub-paragraph (2) above or in paragraph 5 of Schedule 2 to the principal Act shall be taken, in a case where the participator has delivered a return as to which the Board are not satisfied as mentioned in sub-paragraph (1) above, to prevent the Board from basing their assessment or determination on the participator's having had an interest in oil won and saved from the field different from that on which he based his return.