Growing among the moss on the edge of lawn.
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Why don't you add the identification yourself as it does not matter if you are wrong.If you do this and people agree then you will get points for being right and build up a rating,if your not sure of the scientific name all you do is press the recommended button.
This may be the Clevedon Violet
They are usually much larger than our native English violets. I think that it is a Russian species. Cultivated here in the 19th c but now naturalized.
Lat/Lng: 51.6, -1.5
OS grid ref: SU4090