He soon withdrew on a point of principle, after learning that it was local custom to pay each voter two guineas in order to secure their vote.
Despite lacking popular appeal, and refusing to bribe voters in a similar way to those of Hull, he became respected as a man of morals and integrity.
This period 1797–1810 was a time of major change and great confusion in the British banking system, and the currency crisis of 1797 led to Thornton's greatest contribution as an economist, for which he is most remembered today.
Thornton was one of the founders of the Clapham Sect of evangelical reformers and a foremost campaigner for the abolition of the slave trade.
A close friend and cousin of William Wilberforce, he is credited with being the financial brain behind their many campaigns for social reform and philanthropic causes which the group supported.
In 1791 Thornton played a major part in the establishment of the Sierra Leone Company, which took over the failed attempt by Granville Sharp to create a colony for the settlement of freed slaves in Africa.
In 1802 Thornton was one of the founders of the Christian Observer, the Clapham Sect's journal edited by Zachary Macaulay, to which he contributed many articles.
[8] Henry Thornton was buried at St Paul's Church, Clapham where a commemorative plaque records the fact, with an additional reference to the family vault nearby.
His work on 19th century monetary theory has won praise from present-day economists for his forward-thinking ideas, including Friedrich Hayek, who wrote an introduction to his 'An Enquiry into the Nature and Effects of the Paper Credit of Great Britain', and John Maynard Keynes alike.