首席非官守議員
The longest serving Senior Unofficial Members of ExCo was Catchick Paul Chater, who served a total of 30 years; the shortest tenures was Sir Sidney Gordon, serving under one year. Lydia Dunn was the first female ExCo Senior Unofficial Member. Chater was the only Senior Unofficial Member to die in office; Chau Tsun-nin and Chau Sik-nin were the only Senior Unofficial Members drawn from the same clan.