Thanks Colin, not sure of the wood,
I picked up a couple of logs in the area that I tried out the Lavvu and tarps. They had been there for a while so yes it could be ash, as there were a few Ash trees about, and as I have just looked up spalted, spalted ash is what it could be. I still have a couple of lengths if you would like one?
By the same token, I've got tons (literally) of Beech if anyone wants any (let me know the aprox diameter and length you need and I'll see if I can manage that)