Sorry you're having issues with your return. This is a community help forum for tech issues. You should call Sonos Sales and advise them of the issue. I can say that when shipping internationally a Customs Declaration is required that describes the goods, value and reason for shipping. 

The link may help with understanding why a Customs Declaration is required:

• https://taxation-customs.ec.europa.eu/customs-4/customs-procedures-import-and-export/customs-procedures/customs-declaration_en#:~:text=What%20is%20a%20customs%20declaration,under%20a%20given%20customs%20procedure.

Hold on. So returning an item purchased in the uk cannot be returned to the uk. Sonos, sort this out. Why return to Poland? All Sonos say is print off return label. 

Where do I post this on the community forum?

Shouldn’t matter to you because they are paying return shipping. But good luck, though as their returns process is not great no matter where you live if we are to believe the stream of community post of people having problems getting refunds.

You can post your complaint all over the forum but it won’t resolve your issue. I gave you the path to resolution in my first response. So you have two options which are:

1. Continue wasting your time in this community 
2. Call Sonos sales

I think the point is missed here. I am reaching out for help. As I said I am down here in the Falklands and the wife is stuck back in the UK with this issue. 
I would like to think I am not “wasting” my time. 
Could someone post a link that works please.

Wow…

Scroll down to the bottom of this page and you’ll find the link you need and more. Here’s a suggestion/novel idea try the links labeled Returns and/or Contact Us.