I managed to get into the rocker head and now I'm faced with the "oily inside".
The instructions state:
"Once in the oily bit you will notice a black plastic cable housing running right to left between the two cams. You should then notice four different coloured wires exit from the rear of it and under the rear cam. If you follow each one down to a small black plug, this is the electrical connection to the glow plugs. GENTLY lift this off and out of your way."
I'm following the green wire and I simply can't get my fingers in to remove it. Any tips? Pliers?