They hatched, they munched, they quit

They hatched, they munched, they quit

Observation - They hatched, they munched, they quit - UK and Ireland. Description: A raft of eggs (lepipdopteran?) hatched and the caterpillars then ate this ivy leaf. What were they?

A raft of eggs (lepipdopteran?) hatched and the caterpillars then ate this ivy leaf. What were they?