Thanks Pete. I got the mix from Kreston and experimented a little with it. I undercoated with Vallejo Field Gray. The base was burnt umber, gold ochre, tit white with a little cinnabar green deep. Shadows were burnt umber, highlights were base, plus naples yellow and tit white. Deep shadows were burnt umber and brown madder alizarin and high-highlights were more naples yellow and tit white added to the highlight mix.
It's not the shade I was shooting for, so on the next one I'm going to change the undercoat color and play around with the oil mix a little more.