Thanks clutchdust I'll check it out but would that give me the 'Select Neutral' message and the lack of a light on the switch?

Just bought another P38 2.5DT after a gap of four years and got it cheap because of non-selection of Low Ratio in the Transfer Box. Had the same fault with the first one with display reading 'Select Neutral' and it was the neutral switch on the gearchange stuck. However, on this one I have...