I understand they are going to bring in a number of lower speed limits for aircraft in C above "pressure points" such as Hornsby - a bit like the lower speed limits in school zones.
I am told the proposed limit will be 145 knots.
The reason for the other decision is that one particular Airline has been flying below 10,000' at speeds up to 255- 258 knots giving them an unfair advantage over others who comply with the law.