Ok, so I tinkered with it when I wasn't supposed to.
Fixed some lighting and, when rendered bigger, (via Volkers method on the previous page, thanks!) the trees were awful. I'll tell you a secret, the trees in the first one were 2D plane tgo objects, I thought I'd get pulled on that one as soon as it was posted but no-one noticed(or cared, lol). I made them in Carrara a while back for distant forest purposes, they're a bit too close in this scene though to appear convincing at this size, smaller images or further shots are decent enough with them.
The trees now are the Xfrog Grand Fir from their free 5 species .tgo pack.
Thanks for looking![attachimg=#]