On 24/07/2007 23:52, judith wrote:

I took up a bedroom floorboard. Put aluminium foil on the ceiling run
- hung a second piece of foil vertically with just a small gap between
it and the horizontal piece. Mains to the two pieces across the gap
and bob's your uncle.

So when the house catches fire from a pile of smouldering mice who'll
explain it to the insurance company?