Liggylaura - the law about squirrels seems a bit complicated. As I think I understand it:
1) It is easy, effective, but illegal, to use a non-harming cage trap and to transport the squirrels and release them to a new life elsewhere. It is a criminal offence to do this and I believe that even if you are only caught with a caged squirrel in your car, you can be fined quite heavily. The squirrel is not fined.
2) Killing a squirrel by a relatively humane method (?) is not illegal. But I think that people have been successfully prosecuted for cruelty (or is it "causing unnecessary suffering" etc) for drowning squirrels - and I can understand that, drowning must be a horrible way to go.
All very cheerful . . . sun's out, I think I'll go out in the garden.