Is this a common garden snail?
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I think the iSpot name for this is Cornu aspersum which is why you are not seeing other observations.
Snails of the genus Helix (in the narrower sense) are rather different.
I did not know this scientific name had been changed.
Thank you for the update.
Lat/Lng: 51.8, -2.5
OS grid ref: SO6713