General carreer question

Hi All. I have a question to people who maybe were in similar situation to mine. I live in a country in eastern Europe (Poland). Some time ago I graduated from Finance and now am preparing to Level II. Currently I work in derivatives consultancy.

The question is, is there anyone, who started their career in country similar to mine and then moved to, let say, London, for a job in investment industry? Is it difficult for people from central-eastern Europe to apply for this kind of job and what salary can I expect if I try?

Assuming at that point there will be 3-4 years of professional experience in derivatives consultancy in an international company and CFA programm completed.