Two spring whites

I had a lovely walk along the disused rail line near here that is due to be re-opened in a couple of years to reinstate the east-west Varsity Line between Oxford and Cambridge. Since it was closed by Beeching it has become a really superb butterfly habitat and I was hoping I might find an early Grizzled or Dingy Skipper on a nice sunny day like this. No luck with these today, but I did see lots of butterflies, including these two, considerately posing together on a White Dead-nettle plant. On the left is a male Orange-tip and on the right a female Green-veined White.