Can I just add, and it's a very very rough aproximation, that every watt consumed per 24 hours costs around 1 pound per year. It's easy to work it out exactly I know but sometimes it helps to think 4 watts standy -- thats costing me 4 quid a year and so on.
Its a good guide but all things have to be perspectivised.
I am not saying that consumers should not encourage the development of more efficient and less wasteful machinery but all such energy is not lost... and is not being wasted in all locations at all times of year.
All 'waste' energy is dumped as heat, and a much more important consideration than machine efficiency is how the the house as a whole performs. The 'domestic machine' and it's net energy use.
All waste energy from machines means less has to be supplied by heating systems. Obviously this is less relevant in the South than in the North when addressing the UK ... and season is a factor.
But it is important to be aware of the scalar differences involved. A few watts saved in a machine is nice, but is nothing compared to the kilowatts used and lost from the domestic environment, so if one cares about this issue it is one's dwelling energy efficiency as a whole that should be being addressed primarily.