Wild flower

I found this flower growing in the grass at St Monans.  I have no idea what it is. Does anyone recognize it?
Magnus was at his swimming lessons this morning so I went along to see how he was doing.  I didn't  take a photo as there were other children in the pool. He seems to be doing very well and was actually swimming on his own. The problem he has is he puts his head in the water and has to stop to take a breath. The teacher is trying hard to get him to keep his head up out of the water.  He was jumping in and climbing out on his own.