These Regulations amend Offshore Petroleum Activities (Oil Pollution Prevention and Control) Regulations 2005 principally by adding provisions which distinguish unlawful releases of oil from discharges, which may be lawful if made in accordance with the terms and conditions of a permit. They also, among other things: exclude the application of the principal Regulations in relation to offshore petroleum activities to Welsh controlled waters from the low water mark out to three nautical miles from the baseline of the territorial sea; amend provisions relating to procedural requirements for the granting of permits so as to provide for measures to limit damages to the environment. They require, among other things, that an application for a permit to discharge oil must include an assessment of the risk of harm to the environment from the proposed discharge.