Large White caterpillar

Large White caterpillar

Observation - Large White caterpillar - UK and Ireland. Description: At first I thought this was a Large White Caterpillar but rechecked and decided it did not look right. I'm away from home and my books so can anybody help. It was sitting on a garden plant that we were trying to identify, but that's another matter!

At first I thought this was a Large White Caterpillar but rechecked and decided it did not look right. I'm away from home and my books so can anybody help. It was sitting on a garden plant that we were trying to identify, but that's another matter!