On reviewing my plant records against the local flora some interesting question marks have come up, and some bang-to-rights wrong 'uns. And now I find this in the Nature of Fife annals ...
Archaeognatha - bristletails
Petrobius brevistylis : Widespread on sea-cliffs.
Petrobius maritimus : I of May
Another one for checking, along with my Bur-dock and my Water-cress and ...