Protection of the Environment Operations Act 1997 No 156
Current version for 14 May 2020 to date (accessed 8 August 2020 at 05:50)
Chapter 5 Part 5.1 Section 114
114   Classification of offences
(1)  Tier 1 offences are the offences under Part 5.2.
(2)  Tier 2 offences are all other offences under this Act or the regulations.
(3)  Tier 3 offences are tier 2 offences that may be dealt with under Part 8.2 by way of penalty notice.