Sergison became a clerk in one of the Royal Naval dockyards in 1671 and by 1685 was a principal officer and commissioner of the Royal Navy. In 1693 he occupied Cuckfield Place House (Now Cuckfield Park) in Sussex which he later purchased from the Bowyer family. He lived at Cuckfield Place until his death
Sergison continued to work in the Admiralty as Clerk of the Accounts until his retirement in 1719. He built a large collection of papers relating to Admiralty orders to the Navy Board between 1603 and 1717. These papers have subsequently been published.
Sergison died without issue at Cuckfield aged 77 and was buried at Holy Trinity Church. The bulk of his estate passed to his great-nephew Thomas Warden, who had married one of his nieces, and who assumed the surname of Sergison thereafter by a Private Act of Parliament. His House, Cuckfield Park, stayed within the Sergison Family, until the early 1970s.
- Public sculptures of Sussex - Monument to Charles Sergison
- Parishes: Cuckfield, A History of the County of Sussex: Volume 7: The rape of Lewes (1940), pp. 147-163. Date accessed: 4 November 2010
- Leigh Rayment's Historical List of MPs – Constituencies beginning with "N" (part 2)[self-published source][better source needed]
- Wellcome Library Survey - National Maritime Museum
- Open Library
- The History of Parliament: the House of Commons 1690-1715, ed. D. Hayton, E. Cruickshanks, S. Handley, 2002
- Deed Poll Office: Private Act of Parliament 1732 (6 Geo. 2). c. 18
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|Member of Parliament for New Shoreham
With: John Perry
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