6Residence: merchant seamen
At any time when a merchant seaman is not resident in the United Kingdom and would have been resident there but for the nature of his occupation, he shall be entitled to be treated for the purposes of sections 1 and 2 above as resident—
(a)at any place at which he would have been resident but for the nature of his occupation ; or
(b)at any hostel or club providing accommodation for merchant seamen at which he commonly stays in the course of his occupation.
For this purpose " merchant seaman " means any person not having a service qualification whose employment or the greater part of it is carried out on board seagoing ships, and includes any such person while temporarily without employment.