Anti-slug/snail that works

Finally, I can give something back to youse guys.
If you have snail and slug problems, go out and buy a copper mesh pot scrubber.
Pull it apart, and it will stretch quite a way.
Cut it into strips.
Put a little collar around the base of your plant made of plastic, or even cardboard. This is because someone told me that plants don't want to be touched by the copper, and I didn't want to test the veracity of that assertion.
Tie/wrap your mesh strips in a stylin' knot around your plastic collar.
Stops snails.
Had one snail in a milk crate eat 20 2-inch G13x Hash plant babies a few seasons ago. Have never really recovered.

 

Caused great hilarity among friends and family though.
I saw on another site where the folks just plant comfrey around the border of their flower beds, and the snails eat it till they're full, leaving the other plants. Then in the morning when the snails are full and, well, sluggish (sorry) they pick them off the comfrey, and save them up until they have enough for paella. Kinda funny.
That website is Gardening In Spain Cantharis, if you're interested. They seem to follow your discipline of comfrey use somewhat.
I can't seem to find the comfrey roots here. Did you get yours in the UK?

 

You can use any kind of copper material around your plant base to repel snails and slugs. It doesn't have to be mesh, but the mesh scrubbers are easy to get, and they have worked really well for me.