Medical insurance in Poland for a pensioner plus other questions

Hi all we are a married couple thinking of relocating to Lodz Poland from U.K. I am 70 and my wife is 57 who is Polish, we would like to find out about medical insurance in Poland, what are the costs? companies names etc.
What services are available in NHS when I have a Pesel. Also is it true that my pension would be taxed again in Poland as I have already paid the tax in the UK. Also can I have a bank account in Poland that my pension can be paid into in GBP without conversion to PLN ?
I hope someone out there can answer my questions.

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