Foreign Capital Gains - Tax suffered relief

I sold a property in the USA, in late April 2022, which I'd owned about 10 years and have made a sizeable Capital Gain.. I am and always have been UK resident for tax purposes. US tax was deducted from the sale proceeds. I will be reporting this gain on my self assessment form, online, for 2022/23. I believe it should be on page F5, of form S106, in boxes 33 and 37, to report the gain and claim credit, for foreign tax paid. Is this correct? And why do boxes 34,35, 36 and 39 need to be completed? Is "number of days, of which foreign gained accrued," length of ownership?

Hi
As UK resident the whole time, you do not need to complete boxes 34.25 and 36.

Thank you. Do you mean box 35 in your reply, not box 25? I did not raise a question about box 25. Does box 39 need completing?

Hi, 
 

Sorry, yes box 35. Box 39 needs to be completed if you have paid tax abroad and are now looking to claim foreign tax credit relief .

Thank you.