Meanwhile, now that I've replaced my Sony AV receiver with my much older Rotel amp (and other gubbins to turn digital in into analogue out), every time my fridge motor turns on/off, I get a "pop" from my B&W speakers. Can anyone point me in the direction of a reasonably-priced (we're talking less than 50 quid, hopefully) mains power whatever-they're-called to stop the pop?