Where decree of declarator establishing—
(a)a marriage by cohabitation with habit and repute; or
(b)a marriage contracted before 1st July 1940 by declarationde praesentior by promisesubsequente copula, has been granted in the Court of Session, the principal clerk of Session shall forthwith cause the decree, the names, designations and addresses of the parties, and the date, as determined by the Court, on which the marriage was constituted to be intimated to the Registrar General, and on receipt of such intimation the Registrar General shall cause the marriage to be registered.