That's exactly what I do in order to reduce my electricity bill! Leaving things in standby mode costs a huge amount. It certainly doesn't do any harm to the equipment switching them off at the power source after you've closed everything down. As a side benefit it also reduces the fire risk.
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Do you know that we're all in line for succession to the throne? Really?
Well, if forty-eight million, two hundred thousand, seven hundred and one people died I'd be Queen.