I finally managed to get the rear axle built and the car sitting on its wheels! It took a lot longer than expected as time has been at a premium recently. I also was unhappy with the way I had built the lower bearings on the LHS hub. Having built the near side using a different method, and superior I decided to redo the LHS. That meant taking it all apart again and resetting the bearing spacers in the lower wishbone hub bearings.
There needs to be 0.001inch end float on the bearings but as you cannot measure that you add a lot of spacer to give room much float, but something you can measure. Then reduce the amount of spacers (of known width) to get the correct bearing float. I found a good write up on how to do this in a Jaguar XJS owners manual.