All of my public photos (i.e. all that aren't of my family) have a creative commons licence. Individuals or organisations are permitted to use any such image, for any purpose they see fit. It is not necessary to ask permission in advance, let me know, or credit it me. I quite like it when people let me know. I also quite like it when online images link back to the flickr page. However neither of these are prerequisites for using my images. Enjoy.