In reply to Jack Geldard - Editor - UKC:
Cheers Jack. Er, techniques, right, let me think. Yep, the 3rd pic has a bit of remote flash (one remote flash on floor to right of camera). There was no natural light then (it was dark), and remote flash can sometimes work well indoors.
The 4th (and some others) do have a touch of the photoshop. Some have been given that toned look (duplicate layer / desaturate bottom layer / tweak). Why? I'm not sure, it's just a look I like, and toning down the bright colour of the climbing works walls seems to a) focus on the climber a bit more, and b) hide all those dirty marks more. A few were also (obviously...) sepia-ed. But with the backlight from the window and golden colours, they were almost sepia anyway, so seemed to work.
Any help?