I discovered about two great handfuls of sandy mud gunge filling the lower front wing/sill .
Iwas amazed to find no rust in there but removed the gunge and washed it all out and then sprayed some aerosol grease into the aperture.
This used to be a major cause of corrosion on earlier cars but does not seem to affect xms?
Anyway might be a good thing to look at to increase the longevity of body work.
Still three more to do ,the rattle is still there and the engine still cuts out occasionally ,but all said im' still impressed.
Best regards bob.