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Christenings at St Anne and St Agnes between 1747 and 1768 of five children of Benjamin and Mary Catherine Gignac were recorded without further detail.
From 1759-70 his neighbour in Dean’s Court, Aldersgate had been Joseph Clare II (Grimwade p.465).
He was assessed to Land Tax on property there from 1755-89, the last year he appears in the records. A different tenant was assessed on the property from 1790 indicating Gignac had either retired from business there or died.

Was certainly dead by late 1791.

His will was proved at Prerogative Court of Canterbury on 19 November 1791
as
Will of Benjamin William Gignac of Saint Botolph without Bishopsgate , Middlesex

NA Reference:PROB 11/1210/275

7 February 1744 (OS) Benjamin William Gignack Batchelor and Mary Katherine Lestourgen Spinster married at Saint Anne and Agnes London.
(The wife's name given in birth records and the will was Mary C(K)atherine.)