I have a Squeezebox that is connected to an amplifier. I'd like the amplifier to switch on/off whenever the Squeezebox is powered on/off. I don't mind writing some plugin code to SqueezeCenter to do this but in hardware terms I am looking for off-the-shelf components. I imagine that I need some kind of Ethernet controlled power outlet.

I have looked at X10 (I can't bring myself to link to their terrible site), but their product range seems extremely confused and it looks as though I'd have to use both RF and comms-over-mains to implement a computer controlled socket. Does anyone have any alternative suggestions?

Note: Any components should be available and certified for use in the UK.