Thanks, Rosalind. So far tried....
Jeyes Fluid
Mothballs
White spirit
Creosote
Bleach
Urine (fresh and mature)
The moles
love all these.
I've flooded the runs with a hose.
A mate says he gassed his with an old bike inner tube/hosepipe connection but I'm afraid of blowing the car exhaust.
I've watched them at work and tried to stab them.
I have got one with a scissor trap a couple of years ago.
At the moment I've set a trap in a likely run....