If you're on Android you can do it using BubbleUpnp. Not the most elegant though.
Cheers, I did try that but I get an error trying to stream to the Sonos, possibly Upnp not active on router, and it's at the office so I'm not inclined to change anything (not that I could find it in the router settings anyway).
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If you're on Android you can do it using BubbleUpnp. Not the most elegant though.