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of Monacha cantiana compare http://www.ispot.org.uk/node/113710
Hygromia cinctella http://www.ispot.org.uk/node/232328 is much more strongly angled and usually edged with a pale line (the girdle).
You need a side view and a basal view as well as a top view for future observations. Hope this helps. Martin
Now I see the examples I have to agree. If DD adds the M cantiana ID, I would certainly agree it.
Not sure if this shows enough detail to positively ID.
identification is probably correct. The last whorl of Trochulus striolatus is angular so it might be that. The shell is unusually pale in either case.
Lat/Lng: 51.5662, 0.5793
OS grid ref: TQ788884