So the Wattson - does it save you money and help save the environment? Well, not directly. You clip on the clip, turn it on, and it shines out pretty colours and interesting numbers. This does not directly do anything to reduce the amount of power you are using, but it does suddenly make you amazingly aware of how much you are using, and that in turn starts to embed in you the habits of turning things off and thinking about what you are using. Which is great stuff.

It's completely mesmeric too, watching the number jump as you turn things on and off, watching the colours fade from eco-friendly blue to killing-the-planet red. everybody asks about it as well.

Being wireless you can take it round the house with you too, which is very handy for hunting down "power vampires", those things that suck up electricity without you really thinking about them. Surprises for my included the tiny night light we have to stop you stubbing your toes in the dark in the bathroom and the kettle. Eating up a massive 1400 watts, the kettle is the most power-evil thing in the house so far. The good thing is that you don't use your kettle for more than a few minutes at a time, and good job too!

I've not experimented with Holmes yet, but it's only a matter of time.