Moth or butterfly caterpillar

Moth or butterfly caterpillar

Observation - Moth or butterfly caterpillar - UK and Ireland. Description: About and inch long, legs 3, prolegs 4, clasper. Found hanging by a thread in mixed woodland so per

About and inch long, legs 3, prolegs 4, clasper. Found hanging by a thread in mixed woodland so perhaps a canopy feeder.
I tried ID'ing it as Lepidoptera but the system put my post in "Other Organisms" which isn't very helpful.