Regulation 4 Registration officers etc
For the purposes of these Regulations the chief officer of police for each police area shall be the registration officer for that area, and the police area shall be the registration area; and any reference to the appropriate registration officer is a reference—
in the case of an alien who has a residence in the United Kingdom, to the registration officer for the area in which that residence is situated;
in any other case, to the registration officer for the area in which, for the time being, he happens to be.
Every registration officer shall keep for his registration district a local register of aliens containing the particulars specified in the Schedule hereto:
Provided that if a registration officer is not satisfied as to the nationality of an alien he may describe that alien in the local register as being of uncertain nationality or may describe him as having such nationality as appears to that officer to be the probable nationality of the alien.
Anything required or authorised by these Regulations to be done by or to a registration officer may be done by or to any constable or other person who is authorised by that officer to act for the purposes of these Regulations.