Foreign income

Hi
First year of receiving foreign property rent income from Poland, started May 23.
Do I convert each month's rent using HMRC spot rate to get the GBP?
I pay tax each month, on account to polish tax authority. Poland tax return- you do for calendar year.
Do I claim tax relief for the tax included on my Polish tax return only or all payment I made for this period?
For example, the polish tax return is for Jan 23 to Dec 23, but I paid monhtly POA in Jan 24, Feb 24, March 24.
Also POA in UK, it is showing me the tax due to HMRc in Jan 25 but nothing like the payments on account, half of the tax in jan 25 and half for July 25.
Is this correct that on foreign rent income you dont pay POA in UK, just the final one in Jan?
Many thanks

Hi taxq78
Please see guidance at:
Tax on foreign income: Overview and 
Understand your Self Assessment tax bill: Payments on account
Thank you.