The Literary and Philosophical Society of Newcastle-on-Tyne, NE England has, in a recent newsletter, said it had a sapling of the English Whitebeam growing on the roof, which has apparently been moved to a better home. This seems way outside the usual range of this tree, of which there seem to be very few anyway. I know the railway line runs at the back of the building, and that seeds are spreand in the slipstream of trains, but not a berry, surely? And it seems too far for bird delivery. How old might this be? It's about four times the height of the herring gull sitting next to it, on a disused chimney.