Jxc
I had a look on some Polish webpages for you.
Try this:
Lista lotnikw Polskich Si Powietrznych w Wielkiej Brytanii autorstwa T. J. Krzystka
At the bottom of the page, in the middle is a .doc file with a full list of all known Polish RAF personnel between 1940-1947. Although its all in Polish the header of the .doc has an Email address of a Polish gentleman in North Wales that surely will be able to help you.
Interestingly, repeating what I posted above, if you scroll down the list, on the far right column you will often see "1946-48 Polska" - in other words the year & place of death.
Natural causes ? hmmmm....