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Its not Calliostoma...that is top shaped and this specimen has a stepped appearance when looked at sideways on.
It isn't G.umbilicalis which is far flatter in profile.
Gibbula tumida might be a better ID but its diffucult to be sure
....a scale would really have been helpful
What a difficult group this is proving, for me and others it seems.
Not helped much by this shell being so incomplete.
Mike is right - perhaps Gibbula tumida.
Needs to be 'in' Invertebrates.
THREE MARINE PROJECTS
The problem is the lack of views of the aperture and umbilicus.
Have a look at http://www.conchsoc.org/spAccount/gibbula-umbilicalis and http://www.conchsoc.org/spAccount/gibbula-tumida
The decoration does not appear to be like G. tumida.
Lat/Lng: 52.8788, -4.4289
OS grid ref: SH366340