Interesting observation.
The first ever Purple Hairstreak I ever saw was one which settled on the ground. It was a female in Epping Forest and had fluttered down from the Oaks above and settled close to my feet. We were near the Royal Forest Hotel on the outskirts of Chingford in East London which back then, was much more rural than it is now. I was a small boy then and it was not long after WWII had ended. Family treat visits to the countryside like these were rare in immediate post war relatively impoverished UK for many families living in East London back then. Later that fabulous summer's day, another unforgettable sight. My first ever Holly Blue although I did not know exactly what it was then. Never had a reference book not even the 2/6d ( 12.5 pence today ) Observers' Book of British Butterflies.... I did get one of those fine little books a few years later in the early 1950s.

That Holly Blue settled on the dark green glossy leaves of Ivy which was growing all over a three metre high dead tree stump. What a vision with that beautiful Blue Underside compared against the dark glossy Ivy leaves.
In my East London Garden we sometimes saw Wall Browns, Large and Small skippers, Common Blues and the larger Vanessids on my father's dahlias... Yes, it was far more rural back then and those distant images of beautiful butterflies are still vivid in my mind's eye and no doubt sewed the seeds of a lifelong interest in Nature and Natural things. Oh yes, on the leaves of the massive English Elm ( remember them ) which grew at the bottom of our garden was a very distinctive larva. Had no idea what that was back then. I know now ... They were a Comma Larvae. In that same garden, a completely black ( melanistic? ) adult Garden Tiger Moth... again had no idea what that was but do now...
I have a long standing friendship with someone who lives in that area only five minutes walk from that Hotel. I visited him a couple of months ago. Previously, his son arranged a "secret" 70th birthday party for him a few years back. The son casually mentioned to his father about going out for a curry on his birthday as a treat that evening. The two of them arrived at the Hotel to be greeted by fifty friends and relatives where his son had arranged a surprise party. Great time had by all and as I walked back to the car later, I looked across at the area where many moons before, little me had those unforgettable first butterfly sightings.
Great days gorn forever ... as we used to say down the East End...
