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The shape of the sepals (in flower and in fruit if possible) and the shape of the leaves (and hairiness of the leaf stalk) helps to separate violets - very hard to tell them apart from just face-on pictures. The pale spur eliminates some possibilities, but I don't think it makes a definite id. I can just about recognise 5 violets now, but there are still several I don't know.
But someone else might be braver! Could be V riviniana, but several others (that I'm not familiar with) are possible.
Lat/Lng: 51.1681, 0.9662
OS grid ref: TR074451