I think I can safely say without fear of contraception that it is the pupae of the Noctuid Moth. I call the catterpillars cut worms or b***ards - depending what mood I'm in. When you go out in the garden and see something has cut the stems of your plants like a pair of scissors, then that's the fella responsible.
I could be wrong and I'll put my hands up if I am. It is a very large species and the moth could be anything of numerous patterns or colours and then it will take it's chances with the bats.
I was trying to give you a link to lots of photos but for some reason the system is malfunctioning. Just Google Noctuid Moth Images and you should get some good pictures.