These Regulations implement the current version of Annex IV to the International Convention for the Prevention of Pollution from Ships, 1973, as amended by the Protocol of 1978 (“the Convention”). Annex IV contains regulations for the Prevention of Pollution by Sewage from Ships. The current version of Annex IV came into force internationally on 27th September 2003 and amendments have been made to it since that time. These Regulations implement all amendments to Annex IV as at the date of this statutory instrument. Future amendments to the Convention and other instruments referred to in these Regulations will be automatically incorporated into the Regulations by way of ambulatory reference (regulation 4).