Buff Arches 1.
(Habrosyne pyritoides)

A really beautiful moth - a closer inspection gave rise to a great surprise.

Information:
Fore-wing length: 17-20mm. Absolutely unmistakable - no other moth like it. Bright-white and orange. Fore-wing leading edge is white, a row of small but clear white 'arches' along the outer edge and, most distinctively, the trailing edge (nearest to the body) has a dramatic complex 'cut-out' that allows the pearly grey of the hind-wing to show through.
They fly June-August in most places in Britain where there are young trees or managed plantations, bushes, brambles and gardens.