Box / Buxus Caterpillar identification

identifying box Caterpillar which is killing box Buxus hedging

[@jackw9920]

Yeah, been through 90% of the box shrubs on my clients gardens. Most have been dug now but the stuff worth fighting for still gets sprayed regularly which has time consuming but so far successful

[@dagtailgroundmaintenance]

Hungry little fellas. Hope your doing well, mate 👍

[@TKG]

blimey didnt know this was a thing