Does the Queen know the truth about her Archimedes screw?

The Queen has spent £1.8 million pounds on an Archimedes Screw, which will – in theory – provide lashings of environmentally friendly power to Windsor Castle by harnessing the mighty currents of the River Thames. Of course, in reality it will do nothing of the sort, which is why I was originally going to title this story "Elderly Lady Mugged By Climate Cowboys." That's because the amount of energy it is estimated it will produce – 1.7 million kilowatt hours per year – gives an average output of 200,000 watts. This (thanks to m'learned friend Christopher Booker for these calculations) means that Her Majesty's new toy will be producing no more than enough to power 2,000 x 100 watt lightbulbs.

All right, so Windsor Castle probably doesn't use 100 watt lightbulbs…

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