Section 11 | Rule 3: interaction between double taxation arrangements and rules 1 and 2
From legislation.gov.uk
(1)Credit for tax paid under the law of the territory is not allowed under section 9 or 10 in the case of any income or gains if any credit for that tax is allowable in respect of that income or those gains under double taxation arrangements made in relation to the territory.
(2)If credit in respect of an amount of tax may be allowed under double taxation arrangements made in relation to the territory, credit is not allowed under section 9 or 10 in respect of that tax.
(3)If double taxation arrangements made in relation to the territory contain express provision to the effect that relief by way of credit is not to be given under the arrangements in cases or circumstances specified or described in the arrangements, credit is not allowed under section 9 or 10 in those cases or circumstances.