Have been unable to stream Spotify (300kps) on a 8MB line on 2 independent sites.
- Tried everything. Firmware upgrades etc.

Then fully reset, reconfigured it manually and hey presto. Spotify is streaming on the Sonos.

Odd as all bandwidth tests and ping tests ok.
- It was the BBC Iplayer test that showed me a streaming rate (well below my download rate).

Anyway, just posting the solution should anyone else have it.