In the Uttar Pradesh Zamindari Abolition and Land Reforms Act, 1950 (hereinafter called the principal Act), in clause (8) of Section 3, the following proviso shall, with effect from the first day of July, 1952, be added before the explanation, and the notifications issued under the principal Act (including sections 2 and 4 thereof) or the U. P. Land Reforms (Amendment) Act, 1954 (including section I thereof) or the U. P. Land Reforms (Amendment) Act, 1956 (including section I thereof) or the U. P. Land Reforms (Amendment) Act, 1958 (including section I thereof) shall, notwithstanding any judgment, decree, determination or order of any Court be so construed as if the said proviso had, since the said date, formed part of the principal Act, as also of the definition of the word 'estate ' as given in the Uttar Pradesh Zamindari abolition and Land Reforms (Amendment) Act, 1958: Provided that in Mirzapur District each of the areas bounded as given in Schedule VII shall, notwithstanding anything contained in the foregoing definition, be deemed to be an estate.