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I have some of these just flowering in my garden, you have saved me the effort of trying to find what they are in my flower book. Thanks!
I saw something similar, if not exactly the same, in a wooded bird reserve/park at the weekend. I think the ones I saw were Common Dog Violet (Viola riviniana) so I wonder if yours is the same.
Leaf shape and blunt sepals prove this as does flower colour
Wild Flower Society member
Lat/Lng: 50.6, -2.5
OS grid ref: SY6881