| Charles Adair Anderson | Director | 21 Jan 1994 | 20 Oct 2006 | British | 80 years |
| Charles Adair Anderson | Secretary | 29 Aug 1989 | 20 Oct 2006 | British | - |
| Charles Brian Lascelles | Director | 29 Aug 1989 | 29 Aug 1994 | British | 100 years |
| Christopher Michael Devaney | Director | 25 Mar 2024 | 12 Mar 2025 | British | 38 years |
| David Alastair Trollope | Director | 5 Oct 2020 | 25 Mar 2024 | British | 66 years |
| David James Mackay | Director | 29 Aug 1989 | 9 May 2003 | British | 83 years |
| Dermot Julian Jenkinson | Director | 29 Aug 1989 | 30 Apr 1999 | British | 72 years |
| Frederick Ranald Noel-paton | Director | 29 Aug 1989 | 7 Nov 1998 | British | 88 years |
| Giles Robert Bryant Wilson | Director | 20 May 2016 | 24 Aug 2020 | British | 53 years |
| James Douglas Scott Bennett | Director | 29 Aug 1989 | 31 Jul 1999 | British | 84 years |
| John Maxwell Menzies | Director | 29 Aug 1989 | 12 Oct 1989 | British | 100 years |
| Martyn Robert Smith | Director | 5 Jul 1999 | 10 Sept 2002 | British | 71 years |
| Patrick James Macdonald | Director | 9 May 2003 | 19 Mar 2007 | Scottish | 64 years |
| Paul Bernard Dollman | Director | 1 Oct 2002 | 17 May 2013 | British | 70 years |
| Paula Bell | Director | 10 Jun 2013 | 20 May 2016 | British | 59 years |
| Robert Black | Director | 29 Aug 1989 | 31 Dec 1992 | British | 91 years |