| Rt Hon Sir David Martin Scott Steel, Baron Steel of Aikwood | 12 May 1999 | |
| George Newlands Reid | 7 May 2003 | 14 May 2007 |
| Alexander Charles Onslow Fergusson | 14 May 2007 | 11 May 2011 |
| Patricia A Marwick | 11 May 2011 | 12 May 2016 |
| Kenneth Donald Macintosh | 12 May 2016 |