(1) Where a landlord wishes to increase the rent of any accommodation, he shall give the tenant notice of his intention to make the increase and in so far as such increase is lawful under this Act, it shall be due and recoverable only in respect of the period of the tenancy after the expiry of thirty days from the date on which the notice is given.
(2) Every notice under sub-section (1) must be in writing signed by or on behalf of the landlord and either be sent by registered post acknowledgment due to the tenant or be tendered or delivered personally to him, or to one of his family or servants at his residence, or (if such tender or delivery is not practicable) affixed to a conspicuous part of the accommodation.