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whatever ispot converts it to, I mean Cochlearia atlantica Pobed.
...at least according to Stace 3.
Stace 3 is wrong at least according to my Crucifer Handbook
Thanks Tim I see it now, new one for my list, thought it did not look quite right - will have another look next time we are there and hopefully get some better photos of the leaf.
Lat/Lng: 53.929938888889, -2.9846694444444
OS grid ref: SD354486