EXPLANATORY NOTE  (This note is not part of the Regulations)  These Regulations implement and supplement Recommendation 2009/141 of the Marine Accident  Investigation Branch Report on the investigation into the flooding and foundering of the grab  hopper dredger Abigail H in the Port of Heysham of July 2009 (‘the Report’).  The Regulations apply to United Kingdom ships which are cargo ships of less than 500 gross tons  and which are 24 metres or more in length, wherever they might be, and to non-United Kingdom  cargo ships of less than 500 gross tons and which are 24 metres or more in length while they are  within United Kingdom waters and not exercising the right of innocent passage or transit passage  (regulation 3).  Regulation 4 requires bilge water level detectors to be installed in any engine room and in any  other space in which bilge water is likely to accumulate, and for those detectors to sound an  audible alarm at the control position and in all accommodation spaces in the circumstances  described.  The Regulations make provision for exemptions (regulation 5), offences and penalties (regulation  6) and the detention of ships (regulation 7).  A draft of these Regulations was notified on 2nd October 2020 to the European Commission in  accordance with the Technical Standards Directive (Directive (EU) 2015/1535).  Guidance supporting these Regulations has been published in a Marine Guidance Note (MGN  651(M)). Copies of the Report and of MGN 651(M) may be obtained free of charge at  https://www.gov.uk or in hard copy from the Maritime and Coastguard Agency at Spring Place,  105 Commercial Road, Southampton SO15 1EG.  An impact assessment of the effect this instrument will have on the costs of business and the  voluntary sector is published with the Explanatory Memorandum alongside these Regulations on  www.legislation.gov.uk.  © Crown copyright 2021  Printed and published in the UK by The Stationery Office Limited under the authority and superintendence of Jeff James,  Controller of Her Majesty’s Stationery Office and Queen’s Printer of Acts of Parliament.  6