At the nest this evening it was good to see the male working like a demon collecting food for his  4 chicks. What struck me was not only how efficient and skilled he was at finding food, but how much available insect life there must be. I kept a really accurate record of the time between visits to the nest.  In  41 minutes  from 18.11 to18.51, the male visted a total of 10 times.   I have to confess that this level of feeding far exceeded what I expected. The prey being fed is larger than I expected and seems to be mainly Mayfly as I expected it would be.

Here the male (on the left)  displays with a mouthfull of insects, to the female who had just left the nest coincidentally as he had arrived to feed their chicks.

The male about to fly up with food for the chicks.