Just in case anybody doesn't look closely enough the Sonos Zoneplayer is a ZP100, which is the previous model, lower power amp, only Sonosnet 1.0 (so not the range or speed of the current 2.0 devices, same as the Zonebridge though).
I'm not convinced £250 is that great a deal for what is now at least 2 if not 3 years old, however it DOES have audio outputs on it, which the replacement ZP120 doesn't (much to many people's annoyance), so is potentially a little more versatile if you need that functionality.