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Is it a relatively small dogwhelk, ie a young one? Dogwhelk is really all it can be right? It is slightly peculiar looking but it cant be anything else really?
Edit- Apologies, this comment doesnt make any sense unless I explain that at the time I was still confusing dogwhelk and the much larger common whelk.
Lat/Lng: 58.5292, -4.4294
OS grid ref: NC586626