The Brown Argus (Aricia agestis) - wingspan 29mm.
My first sighting this year (if only briefly) of this species was welcomed.
I observed it, took five shots and the it was gone and not to be found again in an open meadow.
Again, I would hope to have seen more by now. This is probably due to the inclement weather in the last week or two and hopefully things will pick with the next emergence of both these species due in August to September.