Caterpillar in curled up Dock leaf

[Mandie]

Hoping someone can help me (again! ) with narrowing down the ID of a caterpillar. It's made itself a cocoon in a dock leaf, by curling up the edge and using silk to secure everything. My partner said it looks to be a green caterpillar with possible stripes (he has far better eyesight than me!). By this morning the cocoon had a lid and the caterpillar is encased.

I know this is vague, but does that type of behaviour point towards a particular species?

This is the only photo we could get, and I don't even think you can see the caterpillar itself.

[Zonda]

That's one for Pete.

[Pete Eeles]

And since it's undoubtedly a moth caterpillar - that's one for someone else

Cheers,

- Pete

[Mandie]

Ooh, at least it's been narrowed down to being a moth, which is a big help. Thanks!

[Dave McCormick]

It might be Angle Shades, I had one that rolled in the ragwort leaf it was eating and pupated in a reddish-brown pupae: http://www.ukmoths.org.uk/show.php?id=1731 but if thats not it, I can't really say unless I am able to see caterpillar/pupae.