Polish workers Living in the UK

I have been asked by a company I look after the PAYE, has asked if can put all their Polish staff members who live and work in the UK, onto a BR tax code for December!

They tell me as they have family in Poland, they are required to complete tax returns there (December year end) and will be taxed additionally on their UK income. Because of the double taxation agreement, they will claim the higher tax paid in the UK against the even higher tax due in Poland.

Then they want me to give them back their tax codes in January or if I refuse, they will complete tax returns in April and reclaim the tax then.

I would be interested in what others think , would do - or even if they have come across this?

Frauke Golding