Merthyr mawr.

         Grizzled skipper

         Brown argus

        Small argent and sable. I have an old version of mapmate, so this
        could be new for the square? I have only seen these on upland
        moors before.
        Also on the wing  Common blue,  Small heath,  Dingy skipper,
        Pyrausta purpuralis and Pyrausta cingulata.