Bordered Straw larvae

I only managed to trap one Bordered Straw here in my Aylesbury garden back in June, but luckily it was a female and she soon laid eggs. I have four larvae feeding up now, three 5th instar and a fourth is a bit smaller; these pictures show the colour variation. Dave Maunder

Bordered Straw larvae, 5th instar

Bordered Straw larvae, 3rd, 4th and 5th instar