1923-1946 - G H Newport
1946-1966 - J S Bolton
1966-1967 - C Bates
1967-1980 - C D Ibbetson
1980-1991 - K Marshall
1991-1994 - J M Armitage
1995-2008 - W Bradley
2008-2013 - G Thomas
2013-2020 - B Thompson
2020- - H Cooper