That's probably the wisest course.Thanks for all the input guys. I think I need to get the electrician back out to have a look as its all a bit over my head.
I think there is probably a bit of a problem of terminology here. In electrical terms, to have the garden "isolated from the house" would mean that no electricity was being supplied to the garden - which I presume is not what you mean. I'm sure that the electrician will be able to sort this out for you.Surely it is possible to keep garden isolated from house and to have a pond with flowing water.
Kind Regards, John