I made a composit pic of all the stages for better comparison (all pics taken in the same lighting conditions)
Its still a little green, but I think adding another layer of brown wash will make it too dark, which assentially makes it a fail, though it is a cool colour that I will save for later reference.
Next up is the Humbrol light olive/brown wash combo, though happily this little colour matching project has become more out of curiosity than necessity as I have been very generously donated a tin of original brown bess (thank you so so much nick-a-tron)

Once I have it, I'll be able keep going to see how close I can get using different techniques. Would be very handy knowing how to mix a batch up at any time, or which paints/washes combo works best :thumbsup
I finally have all the camo colours in, though only one of two tins has arrived, but I can make a good start on painting the camo now, the last tin should show up next week
...and one last helmet detail sorted; replacement chin strap. The one that came with this helmet is blue, not sure if I missed that when I was looking at the pics/details, or if it wasn't mentioned/shown. Picked this one up on the bay for $20 (inc shipping), just need to bash it up a bit (might bury it for a day or two as well) as its new, I just missed out on a couple of well weathered ones, but at least its the right colour.