Withholding tax paid in Qatar

I have a contract of employment with a Qatari resident employer who does not have a place of business in UK. I work remotely from my home in UK. I will be operating a DPNI scheme to account for the tax and employer NI on my earnings. My Qatari employer will be deducting withholding tax at 5% on my earnings before they are paid in UK. Am I able to get Foreign Tax Credit Relief under the double tax treaty for the withholding tax when I complete my self assessment return? Thank you for your help

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