Now Dennis and I have been discussing paint, and said it would be worthwhile putting this in here...
It's all very contentious, and sometimes it really is like watching paint dry.
But here is a rough breakdown of my experiments thus far.
(where possible, all photos have been taken under natural light)
Here's a selection of paints, basically I bought all the browns/greens/greys the model shop had. It may not be ALL of them, but it's 'most'. Certainly the ones we're interested in.

Please note... if you look on the lids of some of the greens, I've painted the pot colour onto half the lid. You can clearly see an 'actual' colour to 'pot lid' colour difference. That's hurdle number 1.
I forgot 30 on the above picture, so here's one of the greens side by side.

Now... I'm using this picture below, which is of Harry's spectacular screen used suit for colour referencing. Thus far it's the only bit I can say that is definitely screen used, and the pictures are taken with the same camera under similar lighting conditions for all samples. Trying to minimise any light/filter disparities.

Harry's knee plate is on the RIGHT.
So I had a play.

These schemes have been painted on Silver HIPS, and then weathered with a light coat of "HotSpot" grate polish. Whilst it's not the same 'stuff' as what Terry used, it is similar and the same method.
From left to right. The colours are as follows.
91 Black Green, 98 Chocolate Brown, 147 Light Grey, 80 Grass Green, 63 Sand.
91 Black Green, 98 Chocolate Brown, 147 Light Grey, 30 Dark Green, 63 Sand.
91 Black Green, 160 German Red Brown, 1 Primer Grey, 78 Cockpit Green, 94 Brown Yellow.
91 Black Green, 98 Chocolate Brown, 147 Light Grey, 149 Dark Green, 93 Desert Yellow
91 Black Green, 98 Chocolate Brown, 147 Light Grey, 149 Dark Green, 94 Brown Yellow
I didn't do any more because the permutations list would be pretty immense. But I think that gives a reasonable selection.
*** Caveat to the above: There will be 'some' lighting difference, because they were not all taken at the same time in the same place, I do apologise for my tardiness in this respect. ***
And that's where I'm at.