421. In general.

A full account of previous nationality and immigration law, now repealed, is beyond the scope of this work; but two aspects of that law as it was prior to 1 January 19831 are crucial for the understanding of the law now in force: citizenship of the United Kingdom and colonies2, and the right of abode3. Citizenship of the United Kingdom and colonies no longer exists, having been replaced by new categories of citizenship4; the right of abode still exists but the provisions determining who holds it have been repealed and replaced5. In order to determine the current national status