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Thank you very much for identifying this.
why dont you guys have a look at thereal gooseneck barnacle ie Mitella/Pollicipes pollicipes, http://eol.org/pages/2949347/overview
and try Lepas anatifera the common goose barnacle Instead
Looked at those links there Chris, They are so completely different as you point out.
Brilliant! You've bumped off the last of the mitellas (hopefully until someone finds a real one). You can see how many there were by searching "gooseneck" or "Mitella" in Ispot
Glad to contribute to an accurate ID Chris, did you see this one from a year ago, not related to the above observation at all but just wondering if you had seen it and if you had any thoughts on it?
Lat/Lng: 51.617289, -4.904343
OS grid ref: SR990949