Any reason why the wood is likely to be sycamore? I've often found CotW growing on beech trees, more so than sycamore. (I'm also trying to grow it via dowels on some beech logs so interested in your reasoning).
You might be right, but my books do not list beech among the trees it grows on, and I've personally never seen it on beech. Usually oak, chestnut, yew, cherry or sycamore.