Poles whose registration under the Aliens Order, [S.R. & O. 1920/448.] 1920, took place on or after the first day of September, nineteen hundred and thirty-nine, and who have been permitted to enter, or to remain in, the United Kingdom in view of circumstances attributable to war, as to which, in case of doubt, a certificate of the Secretary of State shall be conclusive;

former members of any of the forces mentioned in subsection (1) of section one of this Act (including the naval detachment therein mentioned), and members of any of those forces relegated from service therewith;

wives of men of categories (a) and (b), and any woman who, having been the wife of a man of either of those categories, has ceased to be, and has not re-married;

persons who have been permitted to enter the United Kingdom on or after the first day of September, nineteen hundred and thirty-nine, as being followers of a body of Polish forces entering the United Kingdom and dependent thereon or on members thereof, as to which, in case of doubt, a certificate of the Secretary of State shall be conclusive.