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Is it possible, Cathal, that you have here Littorina obtusata var. reticulata?
certainly they are very variable but here there are masses (high % where they exists) of the 'reticulated' ones on certain beaches.
I will be posting up this poser tomorrow.
Yes its quite possible Derek. I think I discovered some time after posting this flat periwinkle that there were 2 options basedf on the size of the opening ie 2 species. I cant remember the name of the other one nor do I have pics of the opening in order to tell if this is the one with the big or the small opening?
Poor you...I'll tell you what, I'll give you an agreement anyway!
Coming back - after this http://www.ispotnature.org/node/437146 I begin to realise that the whole subject of Flats is in disarray. Goodness knows what happens in Uni. Departments when someone chooses Littorina obtusata or L.fabalis to study. Out with penises first perhaps?
Since posting this I think I discovered that aperture size and shape is crucial for deciding the species and even then not completely reliable.
The above ID is probably not reliable without a view of the aperture.
Lat/Lng: 55.0857, -6.0533
OS grid ref: NW414843