1. Notwithstanding anything in paragraph 3 of Part 1 of the Ninth Schedule to the Finance Act, 1947 (which provides that relief by way of credit shall be given only where the person in question is resident in the United Kingdom),—
(a) credit by way of unilateral relief for tax paid under the law of the Isle of Man or any of the Channel Islands may be allowed if the person in question is, for the chargeable accounting period or year of assessment in question, resident either in the United Kingdom or in the Isle of Man or the Channel Islands, as the case may be;
(b) credit by way of unilateral relief for tax paid under the law of any territory in respect of income from an office or employment of profit the duties whereof are performed wholly or mainly in that territory may be allowed against income tax chargeable under Schedule E in respect of that income if the person in question is, for the year of assessment in question, resident either in the United Kingdom or that territory.
§ 2. In sub-paragraph (3) of paragraph 7 of the said Part I (which provides that tax which can be allowed as a credit neither against income tax nor against the profits tax shall be allowed as a deduction in computing the amount of the income chargeable to the profits tax), after the words "the amount of the income," where they last occur, there shall, in relation to credit by way of unilateral relief, be deemed to be inserted the words "of the trade or business in question for the chargeable accounting period next following the period on the income of which the foreign tax was paid."