I cut and cleared a large tree yesterday, but not sure what it is. About 20 - 25m high, straight 10m trunk, grey smooth bark with pale patches, wood almost white. It’s not ash, alder, beech, silver birch, oak, sycamore or chestnut. Thought it might be hornbeam, but it is a bit too big. Not sure about poplars, but the bark is wrong.