Large White (Pieris brassicae)
A common and widespread species which you can pretty well guarantee to see if you grow cabbages or Nasturtiums, on which their caterpillars feed voraciously, Large Whites are noticeably bigger than Small Whites and with blackish rather than grey wingtips. The male has no spot on the forewing upperside and the female has two while they both have two spots on the underside of the forwing.
There are two adult generations, one in spring and one in late summer, the native breeding population being augmented by migrants from the Continent
Images L-R: female; female underside; caterpillars on cabbage leaf
Flight period: March to October.