Had a productive afternoon. Rear axle is now ready for some paint and placed a large order of parts that should arrive tomorrow
So with a bit of luck the axle will be ready to refit by the end of the weekend. Have got to replace the rear tub supports, as they are looking very rotten and with the axle out, they are easy to get at.
Whilst I was ordering parts, I discovered that the front swivel balls are a tad on the expensive side

However, after a quick ferret around the internet, it seems that the front axle from the end of the axle tube outwards, ie swivel assy, hub etc is early RangeRover classic (mainly two door with the course spline 1/2 shafts, with 6 bolt flange) to accomodate the cv joint.
So it appears that it will be very easy to get disc brakes fitted to the stage 1 front axle at fraction of the cost of any conversion kits

and a lot cheaper than renewing the drum brake setup.
I have got an old RRC axle which I intend to strip and double check that everything will fit ok before I go and order a load more new parts.
Has anyone done this before?? or am I barking up the wrong tree??
Spen