Using other iSpot entries think this may be a white-lipped snail
No interactions present.
You are probably right being up in the NW, where hortensis is far and away the commoner one, but nemoralis is there, and can have a white lip, and you can really only do the species by dissection or on a larger sample.
recording wildlife with The Recorder's Year on www.hbrg.org.uk/TRY.html.
Lat/Lng: 58.1, -5.2
OS grid ref: NC1524