Hi Paul,
Service manuals: in the download section of this forum are service manuals for 40s (three of them) plus engine manuals, B series, H series and F series and g/box manuals but I think maybe you have to have 15 posts to access them (could be wrong).
You have not said which engine you have but Haynes do a manual for 40 with F engine which is pretty good as so much is the same chassis and body wise on both petrol and diesel 40s.. Personally I have never got on with the Ellory manual but that's personal choice.
Love the pics! IMO 40s should be used off road as it is such an incredible truck. Like you I always use the 40 perhaps because it is our only vehicle and the pension would not stretch far enough for a 2nd vehicle, even if I wanted one. With a 40 you are in touch with the world beneath and around you.
Regards,
Rodger