Regulation 23
Where on the arrival of a ship from a foreign port it appears to a customs officer, from information in the Maritime Declaration of Health or otherwise, that the ship—
(a)
has during its voyage been in an infected area; or
(b)
is one to which regulation 21(1) applies,
he shall direct the master to take it to a mooring station for detention there unless an authorised officer otherwise allows or directs.