This little patch was on the bank of the stream. I caught a glimpse of the purple flash through the undergrowth and came back later with my camera. There were only one or two patches of it.
There were quite a few of these in the meadow. They are very delicate, and in the daylight look a little more pink than mauve. They have a long stem and a frond type of leaf.
Edit: Thanks to my friend Naomi for the following:
The top one is a toothwort but not sure what kind and the bottom one is cuckoo flower, sometimes called ladies smock.