Related issue/suggestion from:
I'm hoping we'll be able to setup a favorite with a user friendly name. So for your example, you can add that radio station as a favorite in Sonos, then give it a label like 'Dublin Radio', then be able to say "Alex, play Dublin Radio'....
It's going to make things really difficult if this sort of thing can't be done, for both music sources and zone groupings. Besides being annoying and difficult to remember exactly how to say a long command, longer commands also means greater chance for Alexa to get it wrong.
Best answer by John B