Notwithstanding anything to the contrary contained in any other law, all orders under sub-section (1) of section 3 of the West Bengal Land (Requisition and Acquisition) Act, 1948 (West Ben. Act II of 1948)(hereafter in this section referred to as the said Act), made after the commencement of the West Bengal Land (Requisition and Acquisition) (Amendment) Act, 1964 (West Ben. Act VII of 1964), by the First Land Acquisition Collector, Calcutta, purporting to act on the authorisation made by the State Government under sub-section (1A) of section 3 of the said Act by the Government of West Bengal, Department of Land and Land Revenue (Land Acquisition) notification No. 19754-L.A., dated the 22nd November, 1963 (hereafter in this section referred to as the said notification), for requisitioning lands in Calcutta for the purpose of creation of better living conditions in certain areas in Calcutta by the construction or reconstruction of dwelling places for people residing in such areas shall be and shall be deemed to have always been as valid as if
(a) the said notification had been issued by the State Government after the commencement of the West Bengal Land (Requisition and Acquisition) (Amendment) Act, 1964, and
(b) the First Land Acquisition Collector, Calcutta, had been duly authorised by the State Government to make such orders under sub-section (1A) of section 3 of the said Act;
and no such orders and no action taken or thing done in pursuance of such orders, shall be called in question merely on the ground that the First Land Acquisition Collector, Calcutta, was not duly authorised by the State Government to make such orders.