A butterfly fluttered by

We did the seven stile walk today, the first time W has risked climbing over the stiles since her Op. Part of the walk is through woodland and I spotted several of these butterflies as we went through. I looked up what it might be and thought I had found a match until I read that the one I had chosen was only found in Ireland, but having looked further I think it is a green-veined white. No doubt I'll be corrected if I'm wrong!