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Tim, doesn't the presence of "amplexicaul" leaves indicate an identification other than C. danica? And if that only goes part of the way towards a positive identification, the flower colour is more accurately shown in the left-hand part of the picture, the other colour being something of an error as on the original photo the RGB readings were all well over 200 and are all similar.
Still think danica, the fruits are right and are not officinalis shapes. Hard to say from your photo whether they are side shoots, but side shoots often have auricles whereas they may not on the main shoot. The lower leaves (assuming that's what they are) are also somewhat palmately lobed, and look like danica. If you go back measure some petals - up to 4.5 mm in danica, and usually over 5 mm in S Britain (smaller in the north)
Tim, thanks for the response. Will try to make a closer inspection when I manage to get back there.
Lat/Lng: 50.3601084, -4.1745888
OS grid ref: SX454533
A Cornish village near the mouth of the River Tamar.