He also held during the greater part of his ministry the office of clerk to the local board of Clerkenwell, from which he retired with a pension.
[1] In 1864 he resigned the pulpit at Stoke Newington, and soon afterwards took charge of the old Presbyterian congregation at Canterbury, over which he presided till his death on 22 December 1870.
[1] In 1816 he published a small volume of verse, The School-Boy, with other Poems, which was four years later followed by privately printed copies of Honour; or, Arrivals from College: a Comedy.
[1] In December 1838 Cromwell became a Fellow of the Society of Antiquaries, and a few years before his death accepted a Ph.D. from the University of Erlangen.
Besides contributions to the Gentleman's Magazine, Chambers's Journal, and other periodicals, he supplied the letterpress for James Sargant Storer's Cathedral Churches of Great Britain, 1814–19, and also for Excursions through England and Wales, Scotland, and Ireland, a series published in numbers, London, from 1818.