Foreign bank interest and Poland taxt office - ensure you declare gross interest accounts

One silly non-English bank failed to inform me they had given me a special non-resident account (it's written clearly in Greek!) - the upshot being that I have lost some EUR 250 in interest, which I have to pay to the Polish tax office. Undeclared gross interest is reclaimed by the tax office at the rate of 90% of the interest received.

Oh yes, and the hassle involved ...

UK bank accounts: I chose to be taxed at source on my bank account interest (such as it is), but you still need a letter from the bank saying this is being done.

I don't get it.Did you have an account in PLN ?

As I understand it, he had a non-Polish account which paid interest gross (not net, like Polish bank accounts - they pay the tax straight to the tax office) - and he failed to declare this.