Wire wheeled the diff back to bare metal again and sprayed it with epoxy.
Took it over to a Jag axle specialist on Mersea island for check over / rebuild - going to take 5 to 6 weeks as the guy is really busy.
Got the beam, trailing arms and drive shafts powder coated
Loads of zinc plating, got the platers to mask off parts that would cause issues with bearing fit.
Spent the afternoon assembling drive shafts, buggered up one of the stainless gaiter clips and gave up until I get some more !