Regulation 5 Duty to register etc
Within 7 days of these Regulations becoming applicable to him, an alien shall, subject to Regulation 6, attend at the office of the appropriate registration officer and furnish to that officer such information, documents and other particulars (including a recent photograph) relating to him as are required by that officer for the purposes of the local register kept by him or the issue of a certificate of registration to the alien.
Without prejudice to the generality of paragraph (1) an alien attending as aforesaid shall either—
produce to the appropriate registration officer a passport furnished with a photograph of himself or some other document satisfactorily establishing his identity and nationality; or
give to that officer a satisfactory explanation of the circumstances which prevent him from producing such a passport or document.