Just measured and it is about 4mm, I have just reversed the non drive side seal and that seems to have sorted it, have now torqued up the bolt and the cranks spinning freely :P.
I still have the two spacers on the drive side, I needed to do this because my NW ring is fitted to the inner ring of my old 2 by crank, so without the spacers the chain ring sits to close to the chain stay. Its a bit of a bodge but will have to stay like that until I can save for a 1 x 11 group set, role on 1 x 11 shimano slx.
Thanks hive mind.