[TheNorm]

Anisetti v Tokyo-Mitsubishi International plc Case No. 6002429/98
The Indian-born head of credit derivatives at an international Japanese bank in London resigned, claiming he had been made to feel like a 'second-class citizen' by his Japanese employers. He said he had been humiliated, excluded by workers speaking Japanese and underpaid, simply because he was not Japanese. The bank argued that it was 'natural' for Japanese staff to use their own language among themselves. An employment tribunal upheld the complainant's claim that he had been discriminated against unlawfully, not because of his Indian national origins, but because he was not Japanese. The tribunal noted that the bank had maintained a practice which had effectively excluded the complainant from various activities, and treated him less favourably than others. The complainant was awarded around 1 million in compensation.

http://www.cre.gov.uk/gdpract/employ...e/parttwo.html

In the OP case, employers are effectively making the situation for themselves by selectively employing non-English speakers. It isn't as if the job requires frequent telephone conversations with staff in Warsaw.