Nothing in this Act affects:
(a) any covenant or any contract or agreement (other than an agreement arising under this Act) made between adjoining owners in respect of a dividing fence before or after the commencement of this Act, or
(b) any law relating to retaining walls, easements of support or other rights of support in relation to land, or
(c) provisions relating to fences or fencing work made by or under any other Act.