SI 2018/68 The Merchant Shipping (Prevention of Pollution from Noxious Liquid Substances in Bulk) Regulations 2018 (link)
These Regulations implement the revised version of Annex II of the International Convention for the Prevention of Pollution from Ships, 1973, as modified by the Protocol of 1978 (the MARPOL Convention). Annex II contains regulations for the Control of Pollution by Noxious Liquid Substances in Bulk. As a consequence of these Regulations, the Merchant Shipping (Dangerous or Noxious Liquid Substances in Bulk) Regulations 1996 and amending instruments (S.I. 1998/1153 and S.I. 2004/930) which implemented the previous version of Annex II, are revoked. Other consequential amendments and partial revocations are also made. Future amendments of provisions of the Convention and other instruments specified in these Regulations will be automatically incorporated into the Regulations by way of ambulatory reference (regulation 4)
The current version of Annex II came into force internationally on 1st January 2007 and further modifications have been made since that time. One of the key changes is to the way in which noxious liquid substances (NLS) are categorised; products are assigned to one of four pollution categories based on an evaluation of their potential harm to the marine environment.
Source: HMSO.