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My ID was based on the shape of the sepals.
I must learn not to make such snap decisions! Didn't even think of hairy violet but the glossiness of the leaf and the hairs along its stem are a better fit than sweet violet.
Its very early for hairy violet but this year is odd. The flower shape is more hairy than sweet. Can't really be sure from this photo alone
Agree, must be hairy or sweet from sepal shape.
Comparison with leaf edge of sweet would suggest hairy and location on limestone would fit.
Lat/Lng: 50.5, -2.0
OS grid ref: SZ0276