Brown Argus (left) and Common Blue (right) at Brandon Marsh and Brandon Reach last Sunday. The males of these closely related #Butterflies have very different upper wings, but very similar under wings.
At first I thought the Brown Argus was a female Common Blue, as the upper wings of the latter have variable amounts of brown colouring. But @rob_camera suggested we might in fact be taking our very first Brown Argus pics, and he was right!