This is not my photo but one borrowed from elsewhere. I saw one of these for the first time in my life today, in the meadow behind the church.
Unfortunately (and no surprise at all) the camera refused to co-operate and I got no pictures. I'll be going back to look for him, though. Moira insisted on going back with me later but there was no sign of him
It's a migrant butterfly... a 'blow in' from the Continent... so you're only likely to see one if you live in East Anglia, as I do, and even then only by chance