Yes everyone in the U.K. has the same issue - no sonos aggregator services will play anything from outside the U.K.. I’ve managed to manually add a few stations I listen to a lot but it’s really unacceptable that all non U.K. stations are gone.

As you, i thought it was Sonos but when i installed my tuner radio app and try the non UK channels, it was the same issue. It’s not from Sonos but it’s the mytuner Radio’s doing this one I believe

I’ve contacted myTunerRadio today and they have come back to me asking my location. 
I’ve just replied and will update when I know more but I’m wondering as they seem to be based in Portugal whether it’s something to do with the UK leaving the EU and copyright issues? 
….on the other hand I have tried using MyTunerRadio through a VPN but it didn’t make any difference. 

I’ve now got an answer from myTunerRadio App. They have confirmed that the UK is blocked from receiving radio stations from outside of the country. What a tiny isolated place we have become. 

You are correct. I got a reply from the people at myTunerRadio. They do firmed that the UK is blocked from receiving any radio station from outside the country. 

The block originates from a commercial court decision.  If you can add a direct url for a station then it should still work. 

How you can add directly the URL/Radio Player in the Sonos? 

I have now dumped my Sonos speaker system which is now useless to me and have bought 2 internet radios on which i can still tune into French and Italian radio stations (directly rather than through an aggregator). 

Do Sonos intend doing anything about this

Mytuner and some other providers operate their service in a very similar way to TuneIn.

The outcome of the TuneIn court case in the UK was that providing radio streams licensed for the UK was fine, but providing international streams to the UK market of unlicensed or licensed overseas content was a copywrite infringement, mainly because TuneIn weren’t paying for a license for providing the international stations to the UK market. Other providers operating in a similar way have followed suit and restricted access to streams not licensed for the UK.

The precedence set by TuneIn losing meant they would have little chance in winning when the copyright owners came after them.

Providers such as airable aren’t affected by the ruling as they operate their service in a different way. This means they continue being able to legally provide international streaming services globally including to the UK.

Sonos should provide Airable as an option then. That doesn't seem complex to me

I suspect the details and what’s required are more involved than you think.

airable are more than just a radio link aggregator, their api integrates music platform services, such as Deezer, Tidal, Qobuz and even video content for smart TV platforms.

As a b2b offering it’s not just a case of asking them to hook into the Sonos api, which is most likely what mytuner did. It works the opposite direction where you use a certified hardware partner or you integrate the airable api into your own platform, with appropriate agreements and ndas signed.

https://airablenow.com/airable/airable-api/

Could Sonos integrate airable? If they wanted to sure, it should be possible. Is it worth adding the complexity and costs when Sonos already provide an api for content providers to use? Is it sensible to tie themselves into maintaining a 3rd party api in their own code when content providers have the ability to integrate themselves?

I doubt airable would integrate themselves into the Sonos api without a compelling reason. It would turn their offering on it’s head, likely impact all their content provider contracts, potentially impact their clients and provide them with what benefit?

In reality I’d guess, now we fall outside of the EU, the UK isn’t a big enough share of global revenues to explore, invest and deal with the on-going costs and overhead of doing something required only for the small? (even vs all uk based users) number of international radio users in the UK.

Thank you Brexit, let's remove more freedoms. 

At least we have a blue passport printed in Poland

My suggestion for anyone specifically suffering this issue is to dump Sonos (most people are anyway going by their declining share price and desperate, albeit late apologies) and buy into Cambridge Audio which seem to care about their customers and more importantly, use Airable