A marbled white

Possibly!
I went out with Gatekeeper today to Pamber Forest Nature Reserve to see if we could find some butterflies. Well, there were thousands of them and she seemed to be able to identify nearly all of them. I'm not so clever so I was just chuffed that I saw several different brown ones,  several orange ones, 2 black and white ones, a blue one, a green one, and some white ones. That's all the identification I need!