Colhoun’s presence in England, probably as a youth, was noted in 1758 by John Baker, solicitor-general of the Leeward Islands,
Colhoun voted against government in the Oczakov division of 12 Apr. 1791, but not in that of 1 Mar. 1792. He was listed a supporter of repeal of the Test Act in Scotland in April 1791. Although he did not vote for Fox’s amendment to the address, 13 Dec. 1792, he divided against the war, 18 Feb. and 17 June 1793. He voted for receipt of the Sheffield petition, 2 May, and for Grey’s parliamentary reform motion, 7 May 1793, and continued to divide, albeit spasmodically, with the Foxite Whigs before and after the junction of the Portland Whigs with government. He signed the Norfolk petition for the removal of ministers, 10 Apr.,
Colhoun returned briefly to St. Croix early in 1802, to deal with some of the complex financial difficulties created by a combination of rash mismanagement, shady dealing and bad luck, which had begun to overwhelm him. His principal creditors, the firm of Pinney and Tobin, had to pursue 60 years of remorseless litigation before they recovered all but £8,500 of their total investment of £60,000 in his concerns.
Pressed hard by his English creditors, Colhoun, through his son-in-law, Edward Coke, sought the refuge of a seat in Parliament from the ‘Talents’ in December 1806, but Lord Howick replied that all his endeavours to find an opening had failed. On renewing the application, Coke catalogued Colhoun’s services and sacrifices in the Foxite cause, added that the seat which Colhoun was now prepared to purchase was ‘wanted for only two months either now or at the close of the session’ and furnished a rosy account of Colhoun’s financial prospects which was less than frank. Howick acknowledged ‘the full extent of the claims of Mr Colhoun on the friends of Mr Fox’, but held out little hope. Shortly afterwards Colhoun himself told Howick that he had begun negotiations for a seat, but nothing came of them. He fled to St. Croix later in 1807, was pursued by his creditors and imprisoned, but managed to extricate himself. Before the 1812 general election Lord Moira reported that ‘Colhoun’s money is ready if an opening be found for him’, but it is not clear whether this was Colhoun himself or his son.
According to Pares, he ‘was heard of, from time to time, skulking in France, sending the Pinneys unpleasant lawyer’s letters and even threatening them with a Chancery suit’. On 23 Apr. 1821, when he was living in Jersey, he appointed Coke and one Philip Augustus Hanrott joint attorneys for his ‘realty and personally in the United Kingdom, which he cannot administer because of his residence abroad’, but no further trace of him or his concerns has been found.
