"After much research I've found what seems the best way to send a Spotify stream to the Uniti from Windows.

I've used dsbridge which can be found here.

Extract the dsbridge files and place them in the Program Files/Spotify folder. You'll also need the lame mp3 encoder dll, make sure it's version 3.98.2 and this also needs to be in the Spotify folder. Read the readme.txt file that comes with dsbridge too.

Once you've done that you can then use the Naim vTuner site to set up an iRadio station. There are instructions here on Malcolm Steward's blog on how to use vtuner.

At the station URL entry on vtuner you need to enter in the format 'http://YOUR IP ADDRESS:8124/, e.g. 'http://192.168.1.1:8124/

The IP address being the one of the machine where Spotify will be streaming from.

Restart Spotify and make sure you select iRadio and Added Stations then the named station you set up on vtuner on your Uniti and off you go.

There might be an issue if the IP address changes I guess, and I may have to assign an IP address from the router.

For the purists amongst you this may not be the best way as the stream is being reencoded by lame to 320k mp3.

Certainly works better than the alternatives I can find (jamcast)"

Good luck Philippe!