You probably have to go through a council run process of applying to kill it, having it surveyed, filling out some forms, filling out some more forms, paying a fee, then having to pay for health and safety to come round, buying some totally excessive protective gear, and... by the time you've...
Big ******* snapper trap baited with Cadburys Dairy Milk.
I use a small ******* snapper trap with the above mentioned chocolate for mice in my warehouse and they practically swan-dive into it as long as it's Dairy Milk.