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Did you see what colour the lip of the shell was?
Yes Hayley, a Banded Snail but that's not enough. As Gretta suggests we need to know the colour of the 'lip'
Search iSpot for white lipped or brown lipped snail.
Mine is here http://www.ispot.org.uk/node/350763 and shows how useful a few views are and scale is (apart from the lip!) - all help with ID.
Lat/Lng: 54.3637, -5.568
OS grid ref: NW683023