27. A person shall not be guilty of an offence under regulation 25(1)(a), (b), or (e) where the contravention is a result of—
(a)an accident which could not reasonably have been foreseen; or
(b)natural causes which are exceptional and could not reasonably have been foreseen,
provided that—
(i)all practicable steps are taken to prevent deterioration of the water environment;
(ii)all practicable steps are taken as soon as is reasonably practicable to restore the water environment to its condition prior to the contravention; and
(iii)particulars of the contravention are furnished to the Department as soon as is reasonably practicable. .