Does the sound also occur when idling in neutral?

Yes, it does. It rattles at any time the clutch is out, is just harder to hear when she's moving.

Also whines in all gears but 4th, which I think is a gearbox input bearing problem - although it's been doing that for 5 years now without the new rattle...

Perhaps it's time to get that sorted.

1986 Pajero 2.6l 5spd manual SWB

http://s690.photobucket.com/albums/vv265/RobCambo/