GODWIN DIARY: 9.11.1795 at John King's / 18.3.1796 there / 16.5.1796 there. In Godwin's 1796 list for 1795
One of the proprietors of the Telegraph newspaper, along with John King, Charles Este, George Robinson & David Evans Macdonnell, all of whom were present on the first occasion and all except Robinson on the other two. Said in newspapers to be a half-pay ensign, which fits with a John Williamson ensign of 18th foot, listed in army half-pay from 1783 to 1808
SOCIETY FOR CONSTITUTIONAL INFORMATION: John Williamson of Field Court, Grays Inn proposed member 23.11.1792 by John Moore 2nded John Augustus Bonney
John Williamson attorney 12 Grays Inn Square Law List 1794-1797. Maybe the same as the newspaper owner above but a common name so no reason to think so