I tried to copy the colour of the tank that was on the box, so it ended up being a custom mix of about 4 different paints.
I used masking fluid for the chipping, painted the green undercoat and then stippled some masking on with a firm brush. Painted the top coat then removed the making fluid to show the paint beneath.
Just got a Revell Marder 1A5 in the sale, so hoping that will come out better than this one.
Thanks for the comments guys