I had the RNE app and could connect with Airplay but the quality was very poor. I’ve since, from a recommendation from RNE, downloaded the RTVE Audio app which does sound a fair bit better.
I also went onto vtuner direct and got a message that these stations were currently unavailable, despite them being listed.
Interestingly as a result I’ve discovered that Chromecast doesn’t appear to work with anything on my ND5XS2. (Despite having had the streamer for almost 3 years this is the first time I’ve tried to use Chromecast!) Having searched the forum and read about tokens, I’ve now raised a ticket with Naim to advise/action. I’ve checked both the Naim app and iPhone settings and everything seems to be enabled correctly.
However I can use Airplay so I am (kind of) sorted!