Clumps of violets scattered throughout an area of chalk grassland.
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Was it scented? If so, I'd go with Sweet Violet.
If not, I was thinking that the leaves are looking a little spreading hairy.
As it was on chalk grassland, this might be a possibility.
It could be Viola hirta but the characters needed to distinguish from V. odorata are not shown: length of hairs on the petiole and presence or absence of stolons.
I think with an eye of faith there might just be enough hair to consider the posibility, but agree that there isnt enough in the pictures to be certain. :)
I have attached another photo. There is not much leafage, and no scent at all, so I don't think it's V. odorata. The hairs on the young leaves and petioles are very distinct. So V. hirta does seem a possibility.
If no scent and hairs on petioles distinct, added to being found on chalk grassland, I think I'll go odds on hairy. :)
hairs spreading, leaves ovate= hirta
Lat/Lng: 51.33842, 0.07101
OS grid ref: TQ443619