If using a trap, you want the Kania 2000 which kills them instantly by breaking their neck with a very powerful spring loaded mechanism. You are also required (by UK law) to fit a restricting tunnel to the trap so that other creatures cannot enter and that aspect can be helped by mounting it off the ground (eg part way up the trunk of a tree they are known to use.) This one works.
A trowel in the hand is worth a thousand lost under a bush.
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If you catch them - you have to dispatch them....
Even better.
If using a trap, you want the Kania 2000 which kills them instantly by breaking their neck with a very powerful spring loaded mechanism. You are also required (by UK law) to fit a restricting tunnel to the trap so that other creatures cannot enter and that aspect can be helped by mounting it off the ground (eg part way up the trunk of a tree they are known to use.) This one works.