caterpillar on Pulicaria vulgaris

caterpillar on Pulicaria vulgaris

Observation - caterpillar on Pulicaria vulgaris - UK and Ireland. Description: noticed this chap apparently feeding on small fleabane on road verge. Would be grateful for any suggestions on which species it might be. About 25mm long.

noticed this chap apparently feeding on small fleabane on road verge. Would be grateful for any suggestions on which species it might be. About 25mm long.