[Ozric Jonathan]

That's a really interesting site Vikki. Though my back was aching just thinking about digging out that cubic metre of soil for the heatsink!

And the car heater that plugs into the lighter socket sounds promising - it must be running off direct current and in the right range power-wise or else it would drain the car battery too quickly.

If the heater was only on for a short time there is every chance that the trickle charge during the daytime would be enough.

What we need is for CB to be at the cutting edge here and get the necessary bits and give it a try!!