Thanks folks - anyone know what kind of wattage would be good for the inverter, or can recommend one?
I presume something like this would be OK?
http://www.amazon.co.uk/product-reviews/B000OO9V48/ref=dp_top_cm_cr_acr_txt?ie=UTF8&showViewpoints=1
Thanks for the link. I'm thinking the inverter might be useful for other things though....
I use one of these, think it was £12 or so out of Tesco....
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They have their uses but be aware they are really good at draining car batteries.
I have one of those in the car, very handy.
I only use it when the car is moving.

I use one of these, think it was £12 or so out of Tesco....
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Okay, still a waste though! I don't see too many phone chargers using an inverter?
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Neither my wifes phone, my daughters phone or my phone came with a car charger. Nor did plenty of other portable devices, if you have a 3 pin plug this type of divice is very useful. It also charges anything from a usb port too.