Recently (in 2014) a authentic British Fish and Chips restaurant opened up in the heart of Krakow. The Dorsz British Fish & Chips, on Św.Anny 4.
We have tried it out a couple of times, and been impressed both times. The chips are tasty (and similar to UK chippy chips), the fish (and chicken nuggets) tasty. If you are from England and want a bit of a UK meal in Krakow then you should check out The Dorsz British Fish & Chips. It is 2 minutes from the main square, in the old town.