| | | | |
| Thomas Brandreth R.N. | Explanation |
| |
| Date (from) | (Date to) | Personal |
| 6 August 1825 | | Born |
| 10 December 1894 | 15 February 1886 | Died |
| |
| Date | Rank |
| 23 December 1845 | Lieutenant |
| 5 February 1858 | Commander |
| 9 May 1863 | Captain |
| 31 December 1878 | Rear-Admiral |
| 30 October 1884 | Vice-Admiral |
| 14 July 1889 | Admiral |
| 1890 | Retired Admiral |
| |
| Date from | Date to | Service |
| 23 April 1846 | | Lieutenant in Constance, commanded by George William Conway Courtenay, Pacific |
| 5 June 1858 | | Commander (2ic) in Orion, commanded by Edwin Claton Tennyson D'Eyncourt, flagship of Rear-Admiral Charles Howe Fremantle, Channel squadron |
| 28 October 1858 | | Commander (2ic) in Marlborough, flagship of Vice-Admiral William Fanshawe Martin,Mediterranean |
| September 1865 | 14 December 1865 | Captain in Edgar (until paying off at Portsmouth), flagship of Rear-Admiral Sidney Colpoys Dacres, Commander-in-chief, Channel squadron |
| 20 April 1869 | | Captain in Lord Warden, flagship of Vice-Admiral Alexander Milne and then (25 October 1870) Vice-Admiral Hastings Reginald Yelverton, Mediterranean |
| 21 May 1874 | 9 January 1877 | Captain in Excellent, gunnery ship, Portsmouth |
| 9 January 1877 | 4 January 1879 | Captain Superintendant of Sheerness Dockyard |
| 3 February 1879 | 1 December 1881 | Superintendant of Chatham Dockyard |
| 12 April 1882 | 6 February 1886 | Commissioner of the Admiralty (third Naval Lord) |