B.29 Senbority of public officers shall be determined es followsi
(1) As between public officers of the same grade:
(i)By reference to the dates on which they respectively entered the grade.
(ii)If the public officers entered that grade on the same day, by reference to their seniority on the day immediately preceding that day.
(iii)If any public officers who entered the same grade on the same day did so by appointment and not by promotion, then seniority relative to each other shall be determined by reference to their respective ages.
(2)As between public officers of different grades on the same salary scale or the same flat rate of salary, by reference to the dates on which they respectively entered their grades.
(3)As between public officers of diffeeent grades on different salary scalee, by reference to the maximum point on their salary scalei a flat rate of salary being regarded for this purpose as a falary scale with a maximum point equivalent mo the flat rate.