Nigel George PAULET,
18th Marquess of Winchester and Premier Marquess of England (E 1551) died in South Africa on 8 April 2016
Probate notice in the South Africa Government Gazette 15 November 2019 42841 p 59 (Notice to creditors in deceased estates):
005845/2019 [ Notice ref]—(2) Paulet, Nigel George, 22 December 1941, 4112225108082, 6A Main Road, Irene, Gauteng 0062; [Name, DOB. identity number, last address]
(3) 8 April 2016; [date of death] (5) Christopher John Hilton Paulet, c/o PO Box 733, Cape Gate 7562 [executor]
Given item 4 (surviving spouse details) in the notice is blank I would assume that the 18th Marquess was divorced or widowed at the time of his death. He m 1967 Rosemary Anne HILTON
The 19th Marquess (subject to proving his claim and being entered on the Roll of the Peerage) is the late Marquess's elder son (subject to proving his claim and being entered on the Roll of the Peerage) Christopher John Hilton PAULET (Earl of Wiltshire or perhaps he did not use the courtesy title) b 30 July 1969 (of the same address as his father - Gauteng, SA acc to DPB 2019). He m 1992 Christine TOWN and had issue:-
Michael John (Lord St John) b 31 Aug 1999 (heir apparent)
Lady Emma Louise b 1993