tracing my family roots- the surname Tarasiewicz?

I am trying to discover more about a gentleman called "Zigmunty Tarasiewicz" he came to the UK just after WW2 along with quite a large number of other older generation poles, Zigmunty married a british female called Margaret whom happened to be my father's mother though i am not 100% sure if he was born prior to Zigmunty and Margaret's marriage or before as my father was born in 1947. Tragically my father died age 53 in 2000, 6mths later i traced Zigmunty to an address in the Derbyshire area of UK called South Normanton, where he had lived since prior to Margaret death in the mid 1980's, but due to the shock of being told my father had died i didnt persue asking questions and i believe as no contact has been made in a while that it is possible that Zigmunty may have passed away.
If anyone knows how i can go about discovering my ancestry and polish connection this would be really appreciative :-)

thanks to all

Tara

The name is probably Zygmunt.