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I think this is a juvenile snail and I'm not certain whether there are any other species it can be confused with - juvenile snails sometimes have colour patterns than differ from the adults. I don;t know enough about snails to agree or disagree with it being Copse Snail, but would be interested to hear from others whether this one can be identified safely.
The very useful key that Grant mentions above can be downloaded from:
Entomologist and biological recorder
Lat/Lng: 51.43372, -2.76236
OS grid ref: ST471707