On the death of his elder brother John in 1792, Foster became his father’s heir and replaced his brother as Member for Dunleer in the Irish parliament. This family borough was disfranchised at the Union, which, like his father, Foster had opposed, thereby forfeiting his place at the revenue board, a point upon which Pitt himself was adamant.
When in 1807 his father was restored to the Irish exchequer, Foster was assured of a seat at the Irish treasury board if he obtained a seat in Parliament.
Foster surprised his father by giving up Parliament in 1812 without warning him of it.
I confess that I did not anticipate that Col. Foster would show that he cared in the slightest degree for the office, but I do think that he feels naturally respecting his father and his services and his claims; and really, if favours are conferred, I know not who has a right to look at them, if Mr Foster has not.
Add. 40181, f. 25; 40225, f. 206; 40280, ff. 72, 82; 40281, ff. 35, 107, 144; NLI mss 7818, p. 22 [letter incorrectly dated 1812].
Foster subsequently grumbled about government’s neglect of his family, maintaining that they had ‘drawn a curtain across the past’;
