Protection of the Environment Operations Act 1997 No 156
Current version for 14 May 2020 to date (accessed 5 July 2020 at 04:32)
Chapter 5 Part 5.2 Section 118
118   General defence for tier 1 offences
It is a defence in any proceedings against a person for an offence under this Part if the person establishes—
(a)  that the commission of the offence was due to causes over which the person had no control, and
(b)  that the person took reasonable precautions and exercised due diligence to prevent the commission of the offence.