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It has been given the common name of 'Knapweed Conch'
That name is common at all.
It has been given the vernacular name of 'Knapweed Conch'
I haven't heard anyone use that name since I commented in 2013, so I agree that "vernacular" is a better description of it!
Lat/Lng: 54.3258, -4.5184
OS grid ref: SC363951