6 wrote:
All I need to do now is add plenty of organic material and cuttings to start
the ball rolling on the manure production front for next years planting.

Do you mean compost production?

Anyone any tips, apart from not adding grass cuttings, as to the best
layering or whatever in a 1m cube old coal bunker?

Do you have holes at the bottom or side of the containers? Why not add
grass cuttings? Anything goes to compost, in equal proportion that is.