13.—(1) A local housing authority must prepare and publish a statement of principles which it proposes to follow in determining the amount of a penalty charge.
(2) A local housing authority may revise its statement of principles and, where it does so, it must publish the revised statement.
(3) In determining the amount of a penalty charge, a local housing authority must have regard to the statement of principles which was most recently prepared and published at the time when the breach in question occurred.