Writing the Self: The journal of Sarah Stoddart Hazlitt, 1774–1843. Gillian Beattie-Smith, Women's History Review 22(2), April 2013. DOI: 10.1080/09612025.2012.726110. Beattie-Smith gives the date of the marriage as 12 May, Sarah Hazlitt's death year as 1843 (she was born in 1774). According to Duncan Wu, they were married on 1 May 1808 and Sarah Hazlitt died in 1840. See Wu, pp. 123, 438.
ucl.ac.uk
Mayes, Ian, "Revival time", The Guardian, 5 May 2001, via Hazlitt Society.