The message ]
from Chris ] contains these words:

Caterpillars are still eating my broccoli.
I've just picked a few off and thrown them a long way away.
But I was amazed that there were any still about.
How long do they go on for?
Presumably they freeze solid eventually?
--
Chris

I haven't looked for a week or so, but I had the same experience of
finding them and feeling surprised in about mid-November.
I'm sure they usually disappear earlier. Lack of hard frost, I imagine.

Janet G