The author, Mark Thomas granted following authorization by e-mail:
"Hi Gerard,
You're welcome to use any photos that are on my site. You can credit them to me and publish them under public domain license. Most of those images are sized down for the page. You can copy the originals."
to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.