Your input is helpful. From every book and source I've read on the topic of British camouflage colours they likely should be the khaki brown. On the other hand, every book I have on Churchill tanks has them illustrated in green. The only brown Churchills depicted are those serving with training units in the UK. I was wondring if there was some special rule for Churchills even though it doesn't make sense. Now that I think of it, 1st army Crusaders are always shown as being painted in some shade of green, but should likely be brown. Perhaps there was an order to repaint equipment heading to Tunisia green? That would seem like a lot of extra effort to throw into an already complex operation.
To add to my confusion is a series of colour shots that I've seen labelled as Churchills in Tunisia, but the same shots are also labelled in other sources as being in Italy. Ahhhhh! OR, there are colour pictures, but the colour is so old and crappy it's too hard to make a definitive call. I have seen a colour photo of a green Crusader III which is labelled as being in Tunisia, but who knows where it was really shot? This guy's definitely a darker green colour:
I still think I'm going to go with Khaki Brown unless someone has some kind of contrary proof.