I'm an English teacher at a further education college in London. Since Poland joined the EU, I've had masses of wonderful Polish students ... until this year. Not a single Polish student! What's happened? Where are you all?
Courses used to be free and we now have to charge fees (new government rules) but the fees are very reasonable - £95 for a one year course, half a day a week.
As an English teacher, you're probably aware, that jumping in the deep end, is better than someone being told how to jump in the deep end, and how it'd feel to do so.
I'm going to guess, that many of you former Polish students wanted to learn English, not for a love of the language, but because of its economic potential. English is the language not only of business, but many other things. Therefore it made sense, at the time.
Now.. instead of paying to learn English, even at the cheap price of £95 per annum, those Poles are learning English at the "deep end".... idioms, slang, accents, swear words et al...... and getting paid to do so.
If I was in Poland, wishing to learn Polish, the last thing I'd do is sign up for a Polish course. I'd learn "on the job"... or probably, to be truthful "on the piwo" !!! :)