You dont say what year your Mog is and therefore how much muck is likely to be under there. Dave W certainly has lots of experience of these things.
I am not sure what care you need to take with the wooden parts if the car is earlier than the 'wood pre-treating' years?
Has anyone used 'Steam Cleaning' to clean the underside 'Nooks & Crannies' or is that just too severe for a Morgan?
Also I read somewhere here its recommended to use Aerosol Motorcycle Grease for Greasing the Leaf Springs?