On 4 July 1807 Thomas published "The Eloquence of the British Senate" by the essayist William Hazlitt (1778-1830). On his death record, his residence is given as Ludgate Hill. The Quaker records note that he "died of consumption" while a death notice in the "Carlisle Journal" for December 19th 1807 says "Suddenly, a few days ago, by the bursting of a blood vessel".
In his will he left £250 to his cousin Isaac Ostell of London and the rest of his estate to his father Jacob, in Cockermouth, there is no mention of a wife or children. He appoints Joseph Johnson, bookseller, of St Paul's Churchyard as trustee and executor to wind-up his business. Johnson was a very distinguished Unitarian publisher who was at the centre of educated middle-class Unitarian society in London. He published Hazlitt's father (a Unitarian preacher) as early as 1766, and was to publish Hazlitt the essayist's first book in 1805. He was also the publisher of Wollstonecraft, Blake, Paine, and most radical and dissenting authors of the day. Wordsworth published his first book with Johnson in 1793. Coleridge published with him in 1798.
Information from Duncan Wu, Professor of English Literature at St Catherine's College, Oxford.