14SWhere a rent is registered in pursuance of such an application as is mentioned in paragraph 11(1) above by a person who intends to grant a regulated tenancy, the registration shall be provisional only until the regulated tenancy is granted and shall be of no effect unless the rent officer is notified in the prescribed manner, within one month from the date of the registration or such longer time as the rent officer may allow, that the regulated tenancy has been granted.