Told ya it were lovely stuff!
Would you believe that they just chuck it by the tens of tonnes around London every year? Deliberately inform everyone working on it that it's "Rubbish for any kind of use, not worth keeping".
My Nephew was looking into collecting some of the massive round stumps that are left over after the councils coppice the things year after year, and seeing if he could slab them, dry it and sell it on, but it proved a pretty heavy undertaking for one young fella with a family, especially one with no powerful connections when it comes to dealing with councils.
Nic.