I have a new development to report. Now when asking to play BBC Radio 2, I've had BBC Radio Cymru 2 play instead. Not everytime but has happened on three occasions. The voice logs are showing my voice was heard correctly.

Brilliant.

It’s a sign … time to learn Welsh.

This could finally tip the balance and make me learn Cymraeg. Sonos Dda. 

Same issue here. Asking for BBC Radio 2 results in BBC Radio Cymru whilst asking for BBC Radio 4 gets you BBC Radio 4 Extra. In both cases, Google Home has correctly parsed the voice command and if it’s not linked to a Sonos as the target speaker, will correctly play the requested radio station. 

I have had this same problem for ages. It is pathetic that it hasn’t been sorted out. 

I can get BBC Radio 2 reliably with the voice command. "OK Google, play 88 to 91 FM". The same technique didn't seem to work for Radio 4 though...

I tried Radio 4 with a Google Home Mini and Sonos Five speaker today and still the same problem of Radio 4 Extra being steamed. 

              This is the same issue that I am experiencing. I was so hoping to find  solution here and quite disappointed to see that it has remained unresolved for so long.                

I got this working.

It is by no mean a fix, but it is at least a functioning workaround thanks to some clever people in the IFTTT community.

Instructions here:

They’re for Alexa, but it works fine with Google Assistant too.

Hi there

We’re still facing an issue with Sonos playing BBC Radio 4 Extra instead of BBC Radio 4. 
Any update?

Thanks

I am adding my voice to the chorus. When asking for Radio 4 or 2 I get Radio 4 Extra or Radio Cymru instead. Very much regretting my Sonos purchase so far.

Can’t quite believe this hasn’t been fixed. My wife may leave me if it isn’t fixed soon!

Still waiting. 
It feels like SW issue in a table. 

has anyone been able to get Radio 4 by asking for a different station. I know asking for 4 xtra does not work. 

Time to get Google speakers.