Thanks for the replies.
Yes I know I got sucked into the thatch is yellow wormhole. I was trying for a brown/grey, so no idea how I thought golden yellow would equate to brown/grey.
I was thinking of maybe a dark brown basecoat (for depth), with a mid grey wet coat, nuln oil wash and something like a linen highlight (very light dry brush)?
But the dark grey ink idea has thrown it into question.
Tomorrow could be a day of experimentation…