Commentary on Sections Part 5: Enforcement. Section 166 and 167: Execution and cost of works required by section 164 notice and enforcement of controls as respects trees in conservation areas
Section 166 enables a council to enter onto land to replant trees subject to a Tree Preservation Order, and to recover any costs incurred as a civil debt.  Section 167 places a duty on an owner to replace trees that are removed in a conservation area.