Just an update with regards to the amount of OLD thread regarding suitability with the CSG.
I've now completed 6 full burns without problem using Ashwoods recommended dust (beech & oak, supplied summer 2013).
Working like a dream, (i'm clearly getting better at not over-tamping the dust, so little residual ash that after running my finger along the mesh having shaken the burnt stuff out, that I was able to simply reload, re-light & replenish my smokebox.
Räucher Gold
E 150-750
Size 0.2 to 2.5 mm
Think any past issues have well & truly been put to bed!
Just need to convince the wife we "need" another variant to try.