If Warsaw is anything to go by, there is certainly demand from Poles for curry now. 12 years ago there was one (maybe two) here, now there are 21 (by my count, I may well have missed a couple).
some kind of small restaurant or takeaway service here.
The technique which seems to work in Warsaw is to open a tiny place with maybe three tables and mainly do take-away. Once you've got a decent regular business flowing in, you can get some investors and open a bigger more formal place in a better location.