Unknown moth (maybe)

Unknown moth (maybe)

Observation - Unknown moth (maybe) - UK and Ireland. Description: An unidentifed flying insect. About the same size as a Gatekeeper butterfly but white and black. It was seen on the Hampshire downs just north of Alresford on a warm, sunny day. However, it seemed to prefer the cool shady part of the path under over

An unidentifed flying insect. About the same size as a Gatekeeper butterfly but white and black. It was seen on the Hampshire downs just north of Alresford on a warm, sunny day. However, it seemed to prefer the cool shady part of the path under overhanging trees. Would love to know what it is - hope someone can help.