Violet growing in garden.
No interactions present.
Spur does not look typical of V.riviniana and flowers appear to arise on non-leafy stalks rising directly from basal rosette. Cannot see hairs nor appendage for comparison. Requires further site investigation/photographs to exclude V.reichenbachiana, etc.
Added further photos to aid with ID. The sepal appendages are 1.5 mm, which I don't think helps. It seeds itself very readily so is fertile. The leaves are sparsely pubescent and the stems are hairless apart from a few hairs near the stipules at the top of the flowering stem.
Lat/Lng: 51.329907748892, -0.75174808502197
OS grid ref: SU870597