Row 1: Chalkhill
Row 2: Common Blue
Row 3: Chalkhill Blue
On a hot (25° C) and humid (82%) day, I made a quick visit to Mill Hill. The Chalkhill Blue Butterflies were nectaring on Round-headed Rampion, Greater Knapweed and Hardheads. The Small Tortoiseshells were overlooked in passing, but when I stopped they appeared everywhere where feeding on the occasional Ragwort flower was possible. They were quick to settle and open their wings.
There was a possibility of an Adonis Blue Butterfly, but this was not confirmed. It was just as likely to be a Common Blue.
The blue butterflies in the medium length grasses would not settle with their wings open, on the muggy humid day, and I could not instantly confirm their identification. It is in a known Chalkhill Blue habitat and the underside has an absence of any orange so it seems that Chalkhill Blue is probable.
Butterfly Conservation Society (Link to pages)