I've written before about all the Polish people and produce that I come across in Colliers Wood.
It turns out that Balham - which is just up the road - has been one of the main centres for Polish people in London since the 1950s and has a a Polish Church. The White Eagle Club (SW17 7BQ) is still a thriving community centre and a popular local restaurant.
"Nothing fancy - just good, hearty, authentic, great value Polish fare. If you want to visit Poland without leaving London, this is the place to come." commented Justin (May 19, 2005) at London Eating which is "Ni wyobraznia (dziwaczny) - po prostu (dopiero co) dobry, autentyczny, wielka wartosc Polska oplata za przejazd. Jezeli wy potrzebujecie (chciec) zeby odwiedzac Polske bez odjazdu Londyn (londynski), to jest miejscem przybywa?" according to the translation tool at www.poltran.com.
That should be my first stop in investigating Polish cuisine I think. The Polish Kitchen by Mary Pininska is currently the leading candidate for the cookery book I will inevitably buy as the author was mentioned in the entry on Polish food in Alan Davidson's wonderful Oxford Companion to Food.