I resent wasting my good home-brew in the slimy little devils.
If you brew you have leftovers in the bottom of the bin - just strain it - the slugs don't mind the yeasty taste.
BTW. The paraffin works but the mice learn to follow the paraffin - when they are really hungry they don't care.
I moved on to white spirit which is more pungent but I only gained two years at most before they learned.
If you grow tall peas you can use guttering to grow the row to 100mm tall where the seed is withered and less attractive. I'd prefer 200mm but you need a better, deeper method - more on this later.
For dwarf peas you'd need an absurd amount of gutter - it's easier to just plant them later when the mice have other targets. This spring is so late I'm planting now - it feels unsafe - another planting may be needed.
For early plantings it's worth covering the rows with a flat piece of expanded metal - the mesh is big enough to let the peas through while keeping the mice out (a hole smaller than a biro).
They will always dig under a sheet because it's shelter. They could dig under the mesh, but so far they haven't shown the nous.
Cheers