A few members recently have posted excellent images of Purple Hairstreaks showing off their iridescence. Please allow me to offer one of my own.
I spotted this female on the footpath at Broxbourne Wood on 30th June (just in time for last month's photo competition

) while I was searching for Purple Emperors. A grey triangle floated over my shoulder and at first I thought it was a leaf, but once it had landed its identity was obvious. She wandered around for a while very photogenically with her wings closed, then she stopped, orientated herself, and (much to my surprise) opened up. I had time to take a few shots before a breath of wind prompted her to close her wings and then take off, disappearing into the trees.
I'm not sure whether such sightings are once-in-a-lifetime experiences or not, but this was certainly my first.
Apologies if you've already seen this image (and thanks to those who rated it

) but for those who don't view the galleries, here it is:
Paul