per annum On appointment £200 After completion of 3 years' service 250 " " 6 " " 300 " " 9 " " 350 " " 12 " " 400 " " 15 " " 450 " " 18 " " 500 " " 21 " " 550 " " 24 " " 600 " " 27 " " 650 " " 29 " " 700