@Rob,

I tested on my end and there were couple of issues including permissions, malformed URI's in the pls file and that the load command takes relative path i.e., load WEBRADIO/BBC_R3HD_Test.pls :-)

Of course due to BBC silly geo-locking of the streams I can't verify whether the URL's actually work, or whether they are automatically refreshed as a result of being loaded as a playlist file in MPD.

Tim

From ssh session

(1) chmod 777 /var/lib/mpd/music/WEBRADIO/BBC_R3HD_Test.pls
(2) nano /var/lib/mpd/music/WEBRADIO/BBC_R3HD_Test.pls

in the File1 and File2 lines remove the space in the URI's
Ex: 1446117678&h= 86402c5541e56f44fbfccca69255992c

(3) Ctrl-x y <return> to save the file

From Moode UI

(4) Browse panel, click on menu for WEBRADIO folder and "Update this folder"
(5) Verify that BBC_R3HD_Test is in Radio Station list

From ssh session

(6) telnet localhost 6600
(7) load WEBRADIO/BBC_R3HD_Test.pls

From Moode UI

(8) Verify two new items at bottom of Playlist
(9) Test playback