This is the first review since 2001. The 2001 amendments, which were quite comprehensive--basically, whole sections of the act were rewritten--were the first substantive amendments since 1975. There had been some housekeeping bills and some up-to-date measures that had taken place in the interim, but nothing as substantive as in 2001.
The act, in 2001, said that a committee of Parliament should review the statute within five years of its coming into force and every ten years thereafter. There is a built-in review process.