Hi answerpls,
You have to declare the property income firstly in Poland & then in the UK for the relevant UK tax year.
When you declare the income here you can deduct any expenses that would be allowable if the property was a UK property & let out in the UK.
Any tax that you have already paid in Poland can be taken into account in your final tax bill.
You declare this income & any tax already paid on it on an SA106 Foreign Page.
I have based my answer on the SA106 guidance notes. They can be found here:
Foreign notes Tax year 6 April 2023 to 5 April 2024 (2023–24)
Thank you.