For anyone interested I have identified what is causing my BBC internet radio issue with the new update and my NDS.
It appears that the Sonore UPNP bridge (used to stream music from Roon) and the BBC don’t play together nicely!
If I disable the Sonore bridge by setting it to another zone, e.g. a Muso I can successfully stream the BBC stations.
It’s very odd that this only happens with the BBC stations.