Soil Conditioners?

I suspect that the answers to your questions will depend on your local authority.

We have soil conditioner from our council - have to go to the site to bag it up and take it home.  I think it's called soil conditioner because it hasn't been tested to sufficient standards / levels to be called compost (or I could have made that up, can't remember!)

Sometimes it is also sold already bagged at the local household recycling centre.

Lots of my friends have used it but I am not sure about it.  Whilst the heaps at the landfill place will be hot enough to kill weeds / seeds, I am not sure how the chemicals might dissipate safely.  I'm not organic but I do like to know what I'm putting on my garden or lotty.