"Roger Mills" wrote in message
...

However, it will cost considerably more to run - since it is using
electricity at peak price rather than off-peak price.

Unless I am *extremely* mistaken, all my leccy switches over to cheap rate
at 12.30am and back onto peak rate at 7.30am.
I have one meter outside that shows "normal" and "low" readings, and this is
controlled by a teleswitch.