Too many social media networks!
Really sorry everyone. After far too many people used this image for either commercial purposes, or without giving attribution (or in some cases, both) this image, as well my entire Flickr photostream is now under an "all rights reserved" (i.e. full copyright) license.
If you're currently using the image and giving correct attribution, then you have my thanks and are free to continue to use it.
If you'd like to use the image for any non-commercial purpose, please get in touch ( email hello [at] kexino [dot] com or send me a message here ) and I'll happily send you a copy.