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I don't think this is a violet, but can only think of Alliaria petiolata as an alternative.
5 cm - 7cm. I know Garlic Mustard and am pretty sure it's not that but will crush a leaf next time I'm there to make sure.
Howardian Local Nature Reserve
I thought of Alliaria petiolara as well, but went for Viola - but I agree that they don't look quite right. A close-up of the leaf and petiole would be useful.
Lat/Lng: 51.4, -3.2
OS grid ref: ST2078