Clealry a Pyrgus skipper species but as to which one... The chocie geogrpahically seems to be between Grizzled, Large Grizzled, Oberthur's Grizzled, Olive or Rosy Grizzled but the date of its appearance and various of the makring including the overall colour and the shape of the white makrs on the hind underwing lead me to Oberthur's Grizzled Skipper but I am happy to be told otherwise....