Cabbage moth
Mamestra brassicae (Prutella xylostella)

This species varies considerably in size, with a wingspan of 34–50 mm. The forewings are brown and mottled with a prominent white-edged stigma and a broken white sub terminal line. The hind wings are grey, darker towards the termen. The prominent spur on the tibia of the foreleg is a diagnostic feature, though is best viewed with a magnifying lens.