just an update that may be of use to others, as these shocks seem pretty popular in the uk,( and their cheep-ish!).
I finally got it how i find it works best for me, so Firstly set the sag to find the correct spring preload,compression damping is at 52psi (came set at this, tried less, and more, went back to this).the rebound damping is set one full turn in from full soft,this is clockwise as there are no markings on these things .
this all adds up to a very firm but not uncomfortable ride that suits my slim(i wish!) 18 stone frame. It has also transformed the handling of my Mark 1 ,1200.
cheers
Saty