13.—(1) Advertising activity is permitted without authorisation where it is intended to—
(a)demonstrate support for or opposition to the views or actions of any person;
(b)publicise a belief, cause or campaign; or
(c)mark or commemorate an event.
(2) But this exception does not apply to advertising activity that promotes or advertises—
(a)a good or service; or
(b)a person or body that provides a good or service.