Trees with a Tree Preservation Order are specially selected for their beauty, prominence, and history, and are classed as having high value to the local area. As such, the Local Authority mark them on a plan and has a number in a schedule. If trees on your property have Preservation Orders on them, it doesn’t mean that you cannot do any work on them but you will need to obtain permission from the Local Authority before work can be carried out and this permission can take time to receive.