Congreve, who succeeded his father as comptroller of the Woolwich laboratory in 1814, with a salary of £2,500,
He continued to give consistent support to Lord Liverpool’s ministry, though poor health seems to have restricted his attendance after 1824.
On 5 Dec. 1826 the Commons received a petition from shareholders in the Arigna Iron and Coal Mining Company, of which Congreve was chairman, for inquiry into alleged fraudulent practices by its directors. Congreve, who had earlier sent Peel a detailed defence of his role in the affair, was too ill to attend the debate, but he gave evidence before the resulting select committee. In April 1827 its report delivered the damning verdict that while he might not have been ‘cognisant of the particulars of the fraud’ he was ‘too far acquainted ... to be entitled to the plea of ignorance’, and that his conduct had to be construed either as ‘a not unwilling suppression of scruples’ or as ‘an insensibility to evident obligation which no rule, either of law or morals, admits to be a defence of transgression’.
