I registered long ago, recently in my expat FB group I saw another Brit who's been living here for 20 years insist on not registering because he and I quote: "doesn't have to".
I saw that too. Quite funny actually, especially as there's a high chance that the Schengen countries will announce that legal residency without formality post-Brexit will only be given to those already registered as of the date of the announcement.
Still, if he's lived here for 20 years, I wonder how he avoided registering pre-2004.
I do not have a Polish dowod osobisty, PESEL or passport. I was born in Krakow but have lived in England since 1969.
Terri, just a thought - have you tried applying for a dowód? You've got the address to register yourself to, you've got an entry in the Polish USC, it might just be as simple as that.