Wall Brown?

Today's the day .................... to identify

A new butterfly for me - seen when we were out with Dominic at the Threave Castle Nature Reserve  looking for the ospreys that have successfully bred and have reared three chicks this year.  And we did spot one with the help of the warden (see extra) - but perched too far away for a good picture.

It was a case of out with all the reference books when I got back home and much googling to see what the above might be.  This was the closest I could find.  So unless one of you experts out there comes up with something different, I reckon it was a Wall Brown ..................... ?