Who has powers under the Railways and Transport Safety Act 2003 to take action where an offence is suspected of being committed under sections 78, 79 or 80?

A “marine official” (including a harbour master or his assistant, an MCA surveyor, an MCA superintendent, a UK Customs officer, a British naval or military officer, and a British consular officer) may detain a ship where an offence is suspected, pending arrival of a uniformed police officer. Police officers have powers under the Act to board ships and administer tests, and may make arrests without warrant.