Vapourer?

A flightless female moth on the path this evening which I may have disturbed while gardening. I watched this one climb a dead leaf, perhaps to attract a mate. They have only vestigial wings so stay put and allow the males to find them by pumping out pheromones. I think I've heard that a male can detect even a single pheromone molecule with his antennae.Went out to look at 9.30pm but she was still alone.
Can anyone give a solid ID? Perhaps the vapourer moth Orgyia antiqua?