I actually realised what I was doing wrong for my issue a little while a go, just thought I’d share it. Although the workflow is completely different now, may be it will help some one.
In my ignorance I was using the multidisplacement exporter plugin on an all ready created displacement map in the alpha palette.
This converted the 16bit alpha to a 32bit file, which caused the banding (I think).
As most people were saying, but I didn’t realise, you have to create and export the 32 bit map at the same time.
Hence the “create and export” button that now exists.
Sometimes things only make sense after a while! :idea:
James