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Remember though that some people own amplifiers that cost as much as your average car! With the right kind (read expensive) of setup the power cables will go some way to improving the quality (reducing 'noise') but as you say, its only as good as the weakest link.

Even the cheapest modern amplifiers contain power supplies that reject mains hum to inaudible levels. Any amplifier whose sound changes if you change its power cable is defective and should be returned to the manufacturer.

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No use using that cable on a £300 hifi.

Agreed. And an expensive amplifier's power supply should be even better, and see even less benefit.

Peter