4As soon as practicable after accepting an undertaking to which paragraph 2 applies or (as the case may be) making an order to which that paragraph applies, the relevant authority shall (except in the case of an order which is a statutory instrument)—
(a)serve a copy of the undertaking on any person by whom it is given or (as the case may be) serve a copy of the order on any person identified in the order as a person on whom a copy of the order should be served; and
(b)publish the undertaking or (as the case may be) the order.