Sorry for quoting Notice 35 earlier, but 20 years of calling it that is hard to change.
I think the changes - in GR24 - may affect more private operators. The requirement to use the extension requires the aircraft to have been operated on the G reg for the preceeding 200hrs before coming to either the calender or hours life. Many private aircraft imported over the last few years have probably not done the 200hrs and the engines are over 12 years old. Thus in March they are technically grounded!!!!!! I am talking to the CAA regarding a couple of aircraft in this situation.
ACX