FORGET that - they are useless ! Another stupid idea from a stupid Government !
Get an energy auditor out to your home to advise on how to make your home more energy efficient (and not the type that hand out shower heads and light bulbs
The guy has mentioned "beyond normal" attempts to control energy.. The only real method is as others have said - Measure and Switch.
Know which of those devices are "Stand-By-Wasters". Use your hands !.. Let your fingers do the walking !
Feel things - If it's warm and OFF - you are in trouble !
Feel the facia on the dish-washer - MANY run very warm when OFF. Same for Laundry-Washers and dryers
Plug-Pack power supplies that are warm, are wasting power..
I think that Government specifications require "Switch-Mode" supplies, that have no transformer-losses.
NO - Forget Energy Auditors - They just check for the obvious !