Darter

A couple of weeks ago blipper Diane2104 took a photo of the osprey at Foulshaw Moss so we thought we would take a look on the way up to Keswick. We did get to see the ospreys but they were too far away for a good photo. A bonus was a sighting of a tree pipit which is a bird I had never seen before but again I didn't get a good photo. However there were a lot of willow warblers around and I have included one as an extra (bird 50)

My main shot is a darter but I haven't got a book with me so it is hard to identify but Im sure someone in blipland can identify this. I rather hoped it was a white-faced darter because there were some around but the body doesn't look dark enough although other markings seem to match up. The Seek app isn't helpful but can anyone tell me what it is?