White was the son of a New York merchant, one of 39 loyalists attainted in 1779, who died 6 Aug. 1781. His eldest brother Thomas, his mother and his sisters remained in New York, but Matthew had proceeded to London in 1778 and was in 1781 bound apprentice to the merchant Robert Wigram for five years. Finding no employment for himself, or his younger brother Daniel who wished for (and soon obtained) an ensigncy, he appealed and obtained £25 p.a. for both of them, 16 Nov. 1787, the commission for loyalist claims admitting that his father had been ‘a very zealous loyalist’ who had ‘lost a considerable fortune by his adherence to the cause of Great Britain’. In fact the family had put in a claim for £9,290 compensation, were awarded less than £2,700 and, as only Matthew and his brother in England received any share of it, a grievance developed.
By 1795, White was a London merchant, for he signed the declaration of 2 Dec. in support of Pitt’s government, his address being Finsbury Square. His partner was Cleland. He also subscribed £1,000 from the same address to the loyalty loan for 1797. In 1802 he was one of two candidates who successfully contested the borough of Hythe on the independent (and largely non-resident) interest said to be under the direction of the Chitty family. He was, he claimed, ‘a firm friend to our King, and as firmly attached to our glorious constitution’.
White, who made no recorded speech in the House, appears to have supported ministers until on 15 Mar. 1804 he joined Pitt’s minority on naval defence. On 23 and 25 Apr. he was again in the minorities on defence that brought down Addington’s administration. He was subsequently listed as a supporter of Pitt’s second ministry and on 8 Apr. voted against the censure of Melville. On 14 Aug. 1806, when it was clear that the Grenville ministry would support Viscount Marsham at Hythe, White informed Lord Hawkesbury that he would not have a running partner on the independent interest at the ensuing election.
In 1812 White again found an opening at Hythe and was this time successful, and made a freeman. Meanwhile, with an enormous family to support, his mercantile speculations had ‘not been prosperous’. He subsequently appeared as a spokesman with government for the uncompensated American loyalists, hoping doubtless to recoup his fortunes.
In 1818 White, who had meanwhile become a stockbroker at 44 Lothbury, evidently declined a poll, but his friends put him up ineffectually late in the day.
