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Nothing works.
Not true! This is the video I based our slug fence on. It's all around the edge of a raised bed we grow veg in and it works great.
https://www.youtube.com/watch?v=ZoBeKS64_xc
I just bought a 9v battery and these:
https://smile.amazon.co.uk/dp/B009K1NUY8/ref=pe_385721_37986871_TE_item?sa-no-redirect=1
https://smile.amazon.co.uk/dp/B008EIU7SK/ref=pe_385721_37986871_TE_item?sa-no-redirect=1
https://smile.amazon.co.uk/dp/B000Y8GX4A/ref=pe_385721_37986871_TE_item?sa-no-redirect=1But you also need one of these (I had one already):
It works great. Once the slug or snail crosses the first wire and touches the second they retreat straight away. Occasionally a slug (never a snail) for some reason doesn't retreat or gets stuck and they get fried. I don't lose sleep over that though as it normally doesn't hurt them.
Also totally organic, I didn't want to use slug pellets, too many nasty chemicals in my garden.
Copper tape doesn't work according to this although we have a raised herb bed on top of a built in cupboard in our garden with thick copper edges and it never get slugs in it either...
https://www.bbc.co.uk/news/science-environment-45652170
Copper bands seem to work, until it rains and the foliage bends down, over the band, making a slug bridge.
Nothing works.