judith wrote:

I have just seen in a pound shop some awesome mouse and rat traps.
They are effectively cardboard tunnels with very strong glue on the
internal "walk-way".

It says on the packaging - please dispose of any caught animals
humanely!!

Certainly:
Lump Hammer? Stanley knife? or just a size ten footstep on the
complete issue?

Put them in a hospice, and let them die in peace.