Hi,
UK REITs and non UK REITs are vehicles that allow an investor to obtain broadly similar returns from their investment, as they would have, had they invested directly in property. In the hands of the shareholder, the profits paid out are known as property income distributions or dividends (PIDs) and are taxable in the same way as profits of a UK property rental business.
Where Non UK REITs are distributed, the profits and foreign tax deducted are declared in the foreign sections under 'income from land and property abroad', where a foreign tax credit can be claimed. They are not taxed as dividends, but as property income.
Foreign Tax Credit Relief is restriced in a similar way to dividends. It is declared in boxes 17 to 21 of page TR3 of SA100 Page 2 of 3 of tailor your return, "Did you receive any other UK income, for example, employment lump sums, share schemes, life insurance gains?"
You can see guidance here:
How to fill in your tax return
Thank you.