首席非官守議員
Senior Unofficial Members of the ExCo would customarily be knighted if they were not already knights, although their LegCo counterparts would not. Pre-WWII ExCo and LegCo Senior Unofficial Member typically served renewable four- to five-year terms. Their seniority implied they would not remain as ordinary Legco/Exco members at the end of their terms, but would leave the council on expiry.