The bonnet is GREY on that diagram, no matter what the key says. When I ordered my green with stripes version I must confess it never occurred to me that the bonnet would be anything other than green. Yes, I know, never assume.
If they really supply them in that bizzarre livery I wonder how many shops will have cancelled orders and be stuck with models they can't sell. And no, I can't make the correct shade of green and paint it on top of black so it matches the rest of the model.
Ed
Perhaps Mr Webster should turn his attention to this matter ASAP.