Shell - thanks for that, it seems Nick's definition of 'run dry' isn't the same as the rest of the world's.
The Sea King ELS is a bit more sophisticated than the S61 system sounds - it has a seperate sump and utilises the torquemeter oil supply to lubricate all the crucial areas of the MRGB, especially the input shaft bearings. It may use external lines but allows several hours of fly home time providing the MGB oil temp remains below 145 deg C.