On 28/05/2018 18:46, David wrote:
Having been reminded that coffee grounds are a folk remedy for deterring
slugs, I looked it up online.

Apparently it is illegal to use any untested product as a chemical
deterrent.

Mulching to add organic content is fine, though.......

Ignoring the above for the moment, has anyone tried this and does it work?

Not especially well it is only mildly toxic to them and a bit too soft.
There are other more spikey textures that snails won't cross so easily
like crushed egsshells. My coffee grounds go on the compost heap.

--
Regards,
Martin Brown