Genealogy / Trying to find information on a Polish Airman - ARTUR BERNER, was in Maghull, UK, 1946/47 [4]

Can anyone advise where I can find information about a Polish Airman, last known whereabouts Maghull, Liverpool, Uk, around 1946/47. All we have to go on is a photograph with an address on the back. BERNER ARTUR, ORNETA, UL.BRANIEWSKA.7, BRANIEWO, OLSZTYN, POLAND. We have recently discovered that this man is the biological father of my partner, and we are anxious to find anything about him, but accessing Polish records is proving difficult. Any guidance on where to research would be greatly appreciated.

Thankyou very much. Julie.