Additional info about the NTS Radio Player from customer service
Was curious if you can cast audio from it without plugging it in to speakers and got the following:
Yes — you can plug the Atonemo NTS Radio Player into power only and use it to cast NTS to a Chromecast‑enabled speaker, without any wired audio connection.
The Atonemo NTS Radio Player supports Google Cast as a streaming protocol.
Once powered and connected to Wi‑Fi, it can cast audio (including NTS Radio and any supported streaming service) to any Chromecast‑enabled speaker or device.
This is the same mechanism you use when casting from your phone — except the Atonemo becomes the casting source.
Assumed this was the case, but nice to have confirmation. Will have it plugged in to my older hifi most of the time, but imagine this is good for travelling or taking it round someone else's home.