http://www.legislation.gov.uk/ukpga/1985/22/section/3Dangerous Vessels Act 1985An Act to empower harbour masters to give directions to prohibit vessels from entering the areas of jurisdiction of their respective harbour authorities or to require the removal of vessels from those areas where those vessels present a grave and imminent danger to the safety of any person or property, or risk of obstruction to navigation; to enable the Secretary of State to give further directions countermanding those first-mentioned directions; and for connected purposes.1985-05-23texttext/xmlenStatute Law Database2015-09-10Expert Participation2015-03-12 31Where a harbour master has given directions under section 1 above as respects any vessel, the Secretary of State may, for the purpose of securing the safety of any person or vessel (including the vessel to which those directions relate), give directions under this section to that harbour master requiring him—ato permit the vessel to which the directions given under section 1 relate to enter and remain, or (as the case may be) to remain, in the harbour in question; andbto take such action (if any) as may be specified in the directions given under this section, for the purpose of enabling the vessel to do so or for any connected purpose;and the directions under section 1 shall thereupon cease to have effect.2A harbour master to whom any directions are given under this section shall give notice of those directions as respects the vessel in question to the person to whom the directions under section 1 were given or failing that, to any of the other persons mentioned in section 1(2) above, in any such reasonable manner as the harbour master may think fit; and it shall be the duty—aof the harbour master to take any action in relation to that vessel specified in those directions; andbof the harbour master and the harbour authority to take all such further action as may be reasonably necessary to enable that vessel to enter and remain, or to remain, in the habour.