| Geoffrey Edwin Pattie | 29 May 1981 | 1983 |
| Bernard Harold Ian Halley Stewart | January 1983 | October 1983 |
| Archibald Gavin Hamilton | 1986 | 1987 |
| Sir Timothy Alan Davan Sainsbury | 1987 | 1989 |
| Sir Michael Jon Neubert | 1989 | 1990 |
| Harriett Mary Morison Baldwin | 17 July 2016 | 9 January 2018 |
| Guto ap Owain Bebb | 9 January 2018 | 16 July 2018 |
| Stuart James Andrew | 19 July 2018 | 28 July 2019 |