Today I collected caterpillars and a pupa from a lovely couple we visited this afternoon who grow cabbages, amongst many other things. Their cabbages were being munched on by some Small White caterpillars, we removed them all and I saved 4 caterpillars and a pupa to bring home.
Small White Caterpillar
Small White Pupa
The pupa was attached to the cabbage leaf with its webbing.