In reply to petegunn:
My guess is he just wanted a good photo.
Sometimes the cover photo is chosen as it offers a good layout for the title wording, often looking from the left so the letters fit on a nice blue sky.
Called in at Ken's house once for some reason. He was keen to show me ( and Squark ) potential layouts for Extreme Rock. At the same time he asked if I knew who the climber was on the new cover pic for Hard Rock ( Rob Matheson ).
So I guess is he just wanted a good photo, probably one he had snapped himself so avoiding royalties