[2] He became a student of Lincoln's Inn on 26 September 1791, was called to the bar, and in 1804 went to Madras, where he practised with success.
[4] On 1 July 1813 he spoke in a committee of the House of Commons in support of the amendment, moved by Sir Thomas Sutton, on the clause in the East India Bill providing further facilities for persons to go out to India for religious purposes.
[3] Marsh did not seek re-election at East Retford 1818, contesting Sudbury unsuccessfully.
He wrote also some pamphlets, including An Appeal to the Public Spirit of Great Britain, London, 1803, and A Review of some important Passages in the late Administration of Sir George Hilaro Barlow, Bart., at Madras, London, 1813.
He is also the reputed author of two volumes of gossip, The Clubs of London; with Anecdotes of their Members, Sketches of Character, and Conversations, London, 1828, although recent scholarship suggests that Scottish writer Colin Mackenzie may be the true author of this work.