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I photographed this nudibrach in the St Kilda islands two weeks ago. I feel it is likely to be a Aeolidiella sp. but I cannot find one that is tricolour like this one, thank you for your help.
Hard to find, John but pretty sure it's Cuthona gymnota, as in http://doris.ffessm.fr/fiche.asp?varpositionf=63&sousgroupe_numero=&fiche_numero=1898&origine=groupe&fiche_etat=4 .
Thank you Rhossilian, I have just returned from Scotland with photos of 15 species of nudibranch, a new hobby has started!!