the link about meldunek is in Polish.
maybe I missed it, but is there an identified source of the statement that 20% of adult Poles live with their parents? did they mention the age bracket, or any other details? I'm curious because I can't figure out if it's true or not, actually.
Meldunek is about Poles having to have a registered address.
A typical dialogue:
Pole: Where do you live?
Expat: In Warsaw,
Pole: But Where do you actually live?
Expat: In Mokotow,
Pole: But where do you really live
Expat: on Ulica Belwederska, opposite the Hyatt,
Pole: But really live
, where your parents live?
Expat: I haven't lived there for twenty years,
Pole: But you're registered there?,
The meldunek thing was used in Poland during communist times, and they forgot to get rid of it after the Wall came down. In Russia, it was used to control who could live in big cities. In Poland, the government were supposed to get rid of it last year but didn't. Some ex-communist countries stopped it long ago.
The 20% thing is about what address someone is registered at. So it's very possible that a person from Poland can actually live in England but still be registered with family in Poland.