OK, so I was a bit slow on the uptake. I figured it was owrth going through the tutorial to fill a few gaping holes in my knowledge.... filled quite a few. At the moment I'm working on creating 5 coloured surfaces for use in my NZ animation (3 for grass, 1 for trees, 1 for rocks) This one, is for green.
1 terrain with fractal detail, and a surface for rocks (base), snow and green.
I'm using the results from the tutorial slightly differently, incorporating them with my existing way of surfacing. I use the "One for all" group to provide the main colour tinting for the surface, with two extra nodes to create a BW version of the output node for variation (Convert red to scalar and a colour adjust to normalise values). This approach will probably mean I'll end up with two similar groups... one for tinting vegatation and one for tinting rocks.
There's still a bit of variation to go (haven't added blending shaders for the power fractals yet). I'll post a TGD when I've finished one shader. Camera height is 2m.