Hi there,
There are a few different methods of repelling moles from your garden without harming or causing too much distress.
Options:
1) Bio fume mole smokes. This small smoke canisters contain castor oil. Simply place one of these smokes into the tunnels or mole hills and lit the fuse. This will disperse the castor oil around the tunnel network. The theory behind using castor oil is that it makes the earthworms, the moles favourite meal, distasteful and they leave to look for better food. More info can be found at
http://www.ppcsupplies.co.uk/PSBMS
2) Sonic devices. Sonic mole deterrents work by sending bursts of vibrations through the ground. You must remember to get enough units for the product to work. The more 'solid' 'denser' the ground the less units required as vibrations travel better through solid objects. Moles are very timid creatures and this short burst of vibrations will frighten them away.
3) Humane mole traps. This is a live catching mole trap available of the market today. It's a small plastic tube which can be placed directly in the tunnel system. I have found one these kind of traps at
http://www.ppcsupplies.co.uk/PSHMOLE
I think that these are the only humane ways of dealing with moles in the garden.
Best
Fred