Found these on Flickr; new to me at least.
Char 2C
Mk IV
I think the 2C may be pictured nearer WW2 than WW1, but it's a good pic anyway.
New to me as well thanks for posting,
http://www.flickr.com/photos/roblangham
a google search for Arthur Edwin Smith brought this up
http://media.beta.photobucket.com/user/sheepsfoot/media/IMG_0001.jpg.html?filters[term]=Arthur%20Edwin%20Smith&filters[primary]=images&filters[secondary]=videos&sort=1&o=14