Sir Gordon Cosmo Touche | 1956 | 1959 |
Henry Oscar Murton | October 1974 | February 1976 |
Michael John Martin, Baron Martin of Springburn | May 1997 | 22 October 2000 |
Nigel Martin Evans | 8 June 2010 | 10 September 2013 |
Eleanor Fulton Pritchard Laing | 15 October 2013 |