| Graham Eric Stringer | 1999 | 2001 |
| Simon Patrick Tipping | 1999 | 2001 |
| James Murphy | 9 May 2005 | 5 May 2006 |
| Thomas Anthony Watson | 2008 | 2009 |
| Nicholas Richard Hurd | 15 May 2010 | 14 July 2014 |
| Chloe Rebecca Smith | 4 September 2012 | 6 October 2013 |
| Joseph Edmund Johnson | 25 April 2013 | 15 July 2014 |
| Samuel Phillip Gyimah | 14 July 2014 | 12 May 2015 |
| James George Robert Bridges | 14 May 2015 | |
| Christopher James Skidmore | 17 July 2016 | 8 January 2018 |
| Oliver James Dowden | 9 January 2018 | 24 July 2019 |
| Chloe Rebecca Smith | 9 January 2018 | 14 February 2020 |
| Simon Anthony Hart | 27 July 2019 | 16 December 2019 |
| Jeremy Mark Quin | 16 December 2019 | 13 February 2020 |
| John Luther Mercer | 14 February 2020 | 20 April 2021 |
| Julia Louise Lopez | 14 February 2020 | 15 September 2021 |
| Andrew John Griffith | 3 February 2022 | 8 July 2022 |
| Heather Kay Wheeler | 8 July 2022 | |
| Katherine Fletcher | 20 September 2022 | |
| Deborah Stedman-Scott, Baroness Stedman-Scott | 22 September 2022 | 27 October 2022 |
| Dr Michael Alex Burghart | 27 October 2022 |