Tiny flower about 4mm wide.
No interactions present.
Not Field Pansy, more like a Dog Violet or similar.
My Flickr photos...
I originally though it was this but according to my book the flower is much larger.
The ground was very dry and is chalk based. there were several of these flowers of a similar small size. Unfortunately that's the best picture that I got and the violet flower photo looks a bit washed out.
Lat/Lng: 50.7961, 0.245283
OS grid ref: TQ583020