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from TheOldFellow contains these words:

On Turdsday night a rodent eating insulation foam made a pinhole in one
of the polypipes in the loft leading to the UFH. It soaked the
insulation and eventually started to drip through the vapour barrier
and T&G ceiling.

Fixed leak, dried everything - no long term consequence, except...

I am now waging war on the little furry chaps. The simple old
wooden trap is proving the best mouse killer. The special expensive
metal trap is too insensitive and bait is eaten without it going off.

The sensitive-creatures in my household are ag'in me killing them,
however, and truth be told, I'm not so keen myself. Living in the
country next to a water course we inevitably will have rodent problems.

I've tried 'Humane' traps in the past and found them 'Inhumane' as the
trapped mouse dies in great distress unless you can service them once
an hour throughout the night. I find this distressing, and can never
be convinced that it is the right approach.

Now I see Ultrasonic Mouse Deterrents that just plug into a nearby
socket (I have several in the loft) and claim to affect a large area.

E.G: http://bit.ly/v404u

the question is: Do they work? £25 is a lot for a mousetrap, but if it
saves the polypipe....

Any experience? Suggestions?

In descending order of usefulness

1. Cat. Rodents detect the smell of the cat and stay away

2. Traps. Some of the modern plastic ones are brilliant. Work
reliably and no danger of trapping fingers.
http://cgi.ebay.co.uk/The-New-T-REX-...d=p3286.c0.m14

3. Cheap ultrasonic scarers are useless. Very expensive professional
models do work in open spaces