Curval: Hi! (hope all's well with you), I don't believe that the book is NRA prop, but I may be wrong, it's been displaced down the list because a new bunch have come in, but I'll get to it eventually and will write that review.
Eagler: Good suggestion, and one I made too, but unfortunately wife has a total phobia about snakes.
Lasz: The problem with the solution you are suggesting is that it involves using a gun which requires a licence (correct me if I am wrong) albeit with a different type of ammunition.
Skydancer: I saw the pictures you posted: age has not treated you kindly.
I have a solution acceptable to all in the household: I've ordered 3 'neck breaker' rat traps and will put the cats and dog in purdah whilst they're waiting to catch the buggers. They arrive on Friday, hurrah!
Ravs