Genealogy / ORP Błyskawica Crew Records? [46]

Hi I am looking for information on my Grandfather Kazimierz Kowalczyk DOB 14 March 1914, Died August 1990. He settled in Newport, Isle of Wight after WW2.
I cannot find any birth record on Ancestry.com and am unable to find his family as I don't know his parents or siblings names. He served on the Blyskawica with his friend Guzenda.

When my Grandma died in 2007 some men from the Blyskawica came to the funeral but I don't remember their names.
Any information on how I can find more about my Grandfather would be great. Thanks