3. Any operation set out in the Schedule hereto which is treated as an improvement for the purposes of the Hill Farming Act, 1946, as extended and amended by the Livestock Rearing Act, 1951, shall be treated for the purposes of the provisions of the Settled Land Act, 1925, and for the purposes of the said provisions as extended to trusts for sale by Section 28 of the Law of Property Act, 1925, as if it were an improvement of a permanent character included in the Third Schedule to the Settled Land Act, 1925, and specified in Part I thereof, (which specifies improvements the cost of which is not liable to be replaced by instalments).