George Colebrooke entered his father’s bank, and after the death of his father and his brother James was left in sole control; he also inherited a large fortune from them. The family came from Arundel, and by 1754 had built up sufficient influence in the borough for George to be returned in a contested election. From 1761 to 1774 he effectively controlled both seats, while Gatton manor, which he inherited from his brother James, carried with it control of one seat at Gatton.
In 1754 George Colebrooke, like his two brothers, was listed by Dupplin as an Opposition Whig, and on 13 Nov. 1755 spoke, and probably voted, against the Address.
In 1762, when Newcastle fell, Colebrooke held two contracts, one with Thomlinson, Nesbitt, and Hanbury for remitting money for the forces in America, the other with Nesbitt and Franks for victualling them. Though during the debate on the peace preliminaries, 10 Dec. 1762, he and Nesbitt ‘were both in the House and went away to avoid voting’,
Colebrooke was not prominent in the House, though he sometimes spoke on commercial affairs and in East India debates between 1767 and 1772. Outside the House he was conspicuous by his wealth and ostentation, and the ambitious and speculative nature of his financial activities. In 1770 he was reported to be anxious to buy land in Scotland to the value of £140,000 ‘if estates could be found there such as would be an inducement to dispose of a very considerable land property in England, with a view either of getting better immediate returns, or getting estates capable by force of money of being greatly improved’.
An active dealer in Government funds between 1762-4,
He first concerned himself in the Company’s affairs in 1764 in support of the Clive faction,
In 1767 he was elected a director of the Company, deputy chairman in 1768, and chairman in 1769, 1770 and 1772—after 1770 in a coalition with Laurence Sulivan engineered by Lord North. He was thus at the helm when the Company ran into the financial difficulties which led to the Regulating Act of 1773, and his last year of office was turbulent and unfortunate. His management of the Company’s affairs was impugned; he was accused, with some justification, of jobbing its stock when in office; and he suffered severe financial loss over arrangements for procuring votes in the Company’s elections, and by unsuccessful speculation. He was left a creditor of Lauchlin Macleane, and heavily in debt, among others, to Laurence Sulivan and Mary, sister and agent of Richard Barwell. He did not seek re-election to the direction in 1773, and ceased to be actively concerned in the Company’s affairs.
The major cause of his downfall was, however, his speculations in raw materials
After his bankruptcy he retired to Boulogne, so poor that in 1778 the East India Company voted him a pension of £200 p.a.
