Montgomery Harcourt was Minister of State in the Cabinet of Governor-General William Johnson after February 1853. While Minister of War John Wolff was in The Hague negotiating an end to the Rocky Mountain War, Johnson sent Harcourt to London to meet with Prime Minister John Temple to encourge British investment in the Confederation of North America. Harcourt was sufficiently persuasive that Temple commissioned a survey of investment opportunities in the C.N.A. The result was a significant increase in the rate of British investment.
Sobel does not indicate whether Harcourt continued as Minister of State after Minister of the Exchequer Whitney Hawkins succeeded to the Governor-Generalship in August 1856.