Dave, Andrew - thanks for your responses, although I still could not find the data I needed, so I took the the bull by the horns and went to our local Land Rover main dealer, who were extremely helpful, and provided me with the diagrams I was searching for. I am still struggling to solve the problem, but have now eliminated a number of possible causes so narrowing down the field significantly. If any of you out there are expert on the transfer box electrical operation on these models I would be glad to hear from you, as I am coming to the conclusion that the cause of the problem is a can bus issue!!

Thanks for your help so far guys

Roger