Thanks.If you are a UK national, you are taxable on your worldwide income and gains whether you bring them into the UK or not if you are tax resident in the UK and the tax treaty between the UK and the country of origin of the annuity does not limit its taxing to the country of origin.
If foreign tax is deducted from the foreign income, you may be able to claim relief for it against your UK tax liability if there is a double tax treaty between the UK and the country of origin of the annuity.
Take a look here for confirmation of the tax treatment of foreign income.I hope this helps but let me know if you have any further questions.
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