4. For the purpose of paragraph 3, a substance is to be treated as having been unloaded from a craft in an emergency if—
(a)it was unloaded from a craft to which a direction under section 3(1) of the Dangerous Vessels Act 1985(1) (directions by Secretary of State to harbour master) applied; or
(b)it was unloaded from a craft after having been brought into a harbour or harbour area, within the meaning of regulation 2 of the Dangerous Substances in Harbour Areas Regulations 1987(2), without requiring notification under paragraph (1) of regulation 6 of those Regulations by virtue of an exemption under paragraph (5) of that regulation.
S.I. 1987/37, to which there are amendments not relevant to these Regulations.