barnacles not sure which species
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did you want to add a comment, just a . came out. My ID is still the likely one as I have more reputation in this group of organisms(invertebrates in general) but this does not mean my ID is the best one since I know very little about Barnacles.
The opening is kite shaped so might be Chthamalus stellatus or Chthamalus montagui is what I meant to say
Lat/Lng: 53.320319, -4.219869
OS grid ref: SH522826