In sections 182(1)(d) and 190(1)(c) of the Act of 1972 (which require a person serving a blight notice to have been unable to sell his interest except at a price lower than if the land had not been blighted) for the words from " he has been unable to sell" onwards there shall be substituted the words " in consequence of the fact that the hereditament or unit or a part of it was, or was likely to be, comprised in land of any of the specified descriptions, he has been unable to sell that interest except at a price substantially lower than that for which it might reasonably have been expected to sell if no part of the hereditament or unit were, or were likely to be, comprised in such land ".

This section does not affect any blight notice served before 23rd May 1973.