Dock Leaf Darter

This dragonfly landed on a dock leaf this morning and was photobombed by a pair of dock shieldbug nymphs. I think it's a female common darter - the first I've seen on this part of our property.

I heard the familiar sound of swallows at lunchtime and was delighted to find a small flock on the ridge of number two disused glasshouse. (Extras) They didn't stay for long. I can't understand why they don't hang around here as we have plenty of places for them to nest and feed.