153.—(1) Where two or more official search certificates with priority relating to the same registrable estate or charge or to the same registered land have been issued and are in operation, the certificates take effect, as far as relates to the priority conferred, in the order of the times at which the applications for official search with priority were entered on the day list, unless the applicants agree otherwise.
(2) Where one transaction is dependent upon another the registrar must assume (unless the contrary appears) that the applicants for official search with priority have agreed that their applications have priority so as to give effect to the sequence of the documents effecting the transactions.