It was on the Almond Tree a few days ago. See its antennae.
CLOSED: Which is this blue-black moth?
It appears to be Nyctemera coleta, known as the marbled white spot or marbled white moth - http://www.flickr.com/photos/9643110@N08/5685944259
Thanks Flap. I saw this as soon as you replied. It is the one.
An entry is to be created for this I suppose, to add to the BF?