Arun send me the instructions, which are as detailed here once you have logged in.
The stream for Europajazz 1000 is http://www.europaradiojazz.org/stream.flac.m3u
As Arun advised I set the media type to Windows Media.
However the station (and others I have added) is not showing up on the naim iPhone app. I can Airplay from the website to a Mu-so, of course.
Once added the screen then says:
'Your added station EJ will appear on your Naim Uniti after it is next updated. You may update your Naim Uniti immediately by following the Manual Update instructions that came with your Naim Uniti.'
I wonder if this message is out of date (the website is rudimentary) or this only works with a Uniti?