Davis, Welch Unitarian calls 20.1.1803
David Davis DNB 1745-1827 poet and dissenting minister was a radical in politics and became an Arian in theology but some of his congregation broke away to form Unitarian churches. His son David Davis Dict Welsh Biog 1778-1846 was a Unitarian and the diaries of his son Timothy Davis 1779-1860 are in the Nat Libr of Wales (5487-99). As far as I can gather none of the ministries of this family were in London so they are less likely to have been any of the later Davis entries (see Davis after 1805)