Large Skipper (Ochlodes sylvanus)
Large Skippers are fairly common in tall grassy areas from June to August and slightly bigger than the other two "Golden Skipper" species and with wings in distinctive two-tone patches of deep gold and darker brown while the underwings are green and gold with lighter, almost yellow patches.
The grasses Cock's-foot and Tufted Hair-grass are the principal larval food-plants.
Images L-R: male showing black brand on forewing; female; underside
Flight period: late May to August