(1) Subject to subsection ( 2), nothing in this Act shall be taken to prevent 2 or more persons negating, inverting or otherwise altering, by agreement, their rights, duties and liabilities in relation to one another under this Act.
(2) Section 5, this section and sections 7 to 16 (inclusive), 19 to 24 (inclusive), 30 to 32 (inclusive), 39 to 41 (inclusive), 43 to 45 (inclusive), 53 to 57 (inclusive), 61, 61A, 62, 62A, 64 to 67 (inclusive), 79, 88, 90 to 95 (inclusive), 97, 98, 100, 115 and 116 have effect notwithstanding any agreement to the contrary.