be sure to look through the whole list of products, a lot of what is first is the commercial bottle rubbish, but then you find the bags of some good organic stuff; the widest range I have found in one place so far
Apparently some good UK suppliers too, but can't think of any names right now, even though I was told about them...
what do you need and how much of it? I may be able to get you what you need. I have most every rockdust you would be after, and other soil amendments, just let me know....