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Nice group, nice pic.
Found my first today, thought 'twas a Chiton to tickle you with.
Now I have the naming issue to face!
Blue-rayed limpet [Patina pellucida, syn.: Ansates pellucida, Helcion pellucidum, Patella laevis, Patella pellucida]
Lat/Lng: 51.564, -4.3328
OS grid ref: SS384875