Thanks for the reply. That's interesting, I did look at that, but couldn't work out how to play a radio stream. But your advice was the shove in the right direction that I needed!
For anybody else wanting to do this, fill out...
#13 Filename (string)
#45 PK_EntertainArea (string)
#29 PK_MediaType (int)
#13 Filename (string) = URL of stream (eg "http://www.bbc.co.uk/radio/listen/live/r4_aaclca.pls
#45 PK_EntertainArea (string) = the ID for the Entertainment Area in which you would like the playback to occur.
#29 PK_MediaType (int) = 4
Hint: If you don't know what the ID is, on the core...
sudo su <ENTER>
mysql -u root -p pluto_main <ENTER>
mysql> SELECT PK_EntertainArea, Description FROM EntertainArea; <ENTER>
Make a note of the ID, and then...
mqsql> quit <ENTER>