Multiplying voltage by current gives VA *not* Watts! It's possible that the power factor changes significantly between 'standby' and 'on', such that the true power consumption increases more than your calculation would suggest.
Richard.
Only if you're on a really ancient off-peak tariff (pre-dating the Economy 7 'white meter' tariffs that came in in the late 1960s) - and I doubt whether such tariffs & metering exist any more. For normal Economy 7 and Economy 10 deals *all* consumption is metered at the off-peak rate(s) between the designated times, so the cost of standby usage is correspondingly reduced.
No-one, or hardly anyone, will have such an arrangement nowadays. Like the old pre-WW2 lighting and power tariffs such schemes encourage dangerous improvised wiring to cheat the system.
You will gain, but with the normal few watts of total standby usage it won't amount to much.
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