Thank you Max. I cannot find the code under the seat unfortunately.

So go with the Ross / Rose white - NH196 as base colour and then a guess on the blue? I do have the tank in this scheme to match, but it's rather old and could be a bit faded. It's almost a purple blue!

So tank painted but rest of blue and yellow are stickers? Is that correct?

It's a fair point you make - looks like I'll go with the NH196 base and best guess for the blue and yellow.