Andyl, I know your comment was a few months ago, but importing a waste product as cobblestones, versus charcoal of which independent testing shows a lot of it is derived from tropical/sub-tropical species of tree, also imported into the EU. I’d rather import husk than import charcoal if I had doubts that I was supporting deforestation.
The big plus of the cobblestones for me is I can light my Cobb at the same time as friends light a traditional BBQ, stick a big joint of meat in there, and it’s normally fully cooked in the time it takes for the traditional to light, die down and then cook the usual BBQ food.