首席非官守議員
Historically, ExCo Senior Unofficial Member importance greatly exceeded that of the LegCo counterpart, thus their term of office were longer. Before the Second World War, there were only three Senior Unofficial Members in ExCo, whereas there have been four LegCo Senior Unofficial Members. Initially, membership was restricted to Europeans; ethnic Chinese were admitted at a later date. The first ethnic Chinese to be appointed LegCo Senior Unofficial Member was Ho Kai, who held the post from 1906 to 1914. The first ethnic Chinese to be appointed ExCo Senior Unofficial Member was Chau Tsun-nin, who held the post from 1953 to 1959. Prior to Chau Tsun-nin, Chow Shouson was also ExCo Senior Unofficial Member when he stood in for three months following Henry Pollock.