Bronwyn Bishop has a headstart in her quest to remain the Liberal Party candidate for Mackellar after four of her own staff members were granted a vote in the crucial preselection run-off for the blue ribbon seat.

The presence of almost her entire electorate office on the preselectors list has angered some local Liberals hoping for generational change.

Among the confirmed preselectors are Cromer branch president Parry Skene, who works as Mrs Bishop's community engagement officer and Robyn Young, who works a day a week in the Mackellar office.

Electorate staffers Alex Briggs and Toby Williams, who is also secretary of the Mackellar federal electoral conference, were also endorsed as preselectors during a meeting at the Masters Builders Club in Dee Why last Thursday.