Runner Beans Being Eaten

This happened last year. I have put them in a different place this year and the same happens.
They are being eaten overnight with just the stems remaining.
I have tried plastic cloches/sharp sand/grit/egg shells &, pellets.
Are these SAS snails ?
Would growing under plastic sheeting help??
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Thats gardening Andrew, wont matter what you do, the slugs will have them.
Try digging down and placing pots of pellets leaving an inch proud, then put a slate or stone over so nothing else can get to them.
Plastic wont help. You could try the boiled garlic spray but it didnt work on my hostas.
Try nematodes Andrew, they work, stopped them eating mine.
Well the latest is, that I decided to put a small plastic membrane over the stem followed with sharp sand & egg shells and, up to now fingers crossed the bean (yes bean) I have others to pop in as soon as they can cope is surviving well and climbing like a mountaineer.
Definitely slugs. They ate my first batch of Runner Beans, now on my second batch which seem to be okay with a few slug pellets to protect them.
Try this andrew, plastic drinks bottle, copper tape. Cut the bottles into 2 inch circles and place copper tape around the bottle and then place it over the emerging beans. Stops em dead in their tracks and works for brassica's as well. As soon as the beans get to about a foot you can remove them or leave them in place as insurance.