1973: Ensign MN01 (N173) Ford

1974: Ensign MN02 Ford

1975: Ensign N174, N175 Ford

1976: Ensign N174, N176 Ford

(Boro Ensign-Ford N175)

1977: Ensign N177 Ford

(Boro Ensign-Ford N175)

1978: Ensign N177 Ford

1979: Ensign N177, 179 Ford

1980: Ensign N180 Ford

1981: Ensign N180 Ford

1982: Ensign N180B, N181 Ford