Sorry, Rodo - I should have made it clear that the neighbours garden was totally overgrown jungle of just nettles and brambles and has been for years. It gets cut back about once a year but that's about it. He has now cut everything right back and I really thought he was going to do something with it, but nothing as yet - it's just barren empty land..... trust me; I wouldn't throw slugs into a garden that was being used as a garden; I promise!!!!!
I'll have a look at the organic slug pellets but because I have hedgehogs that regularly visit the garden I wouldn't want to have even the slightest risk that whatever I use to control slugs may affect them. Also with the cats I'd worry about them being nosey and trying to eat some of the slug pellets? I'll do some more research on that though.
And I know they are 'only' slugs.... but salt is quite a cruel way to kill them

and I'd struggle to do that.
I could put them on the road as that would be a quick despatch but it would have to be under cover of night no doubt which means they'll all find their way back to my garden by the time a car comes along; we live on a fairly quiet road, esp at night
