Shell width 11mm. Not sure which species? Possibly cellarius due to size and pale body colour?
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Yes, I'd agree with cellarius (Oxychilus cellarius) but they are hard to separate out.
My weak experience is that cellarius is less tightly whorled and a little more transluscent.
It is also my experience that 'flashless' pictures make for better prospects (excellent photo though!).
I think you should put up the cellarius ID and see what comes.
....you may have to put in Oxychilus again
Good luck then.
THREE MARINE PROJECTS
Lat/Lng: 51.37727, -2.38478
OS grid ref: ST733643