See Newman Street 1 to 9 in London Addresses dataset
Thomas Martin Land Tax 3 Newman St 1784 / Thomas Martin Land Tax 4 Newman St 1791-97 / Thomas Martin attorney of Marylebone took appr 1776 Abraham Holden Turner / Thomas Martin attorney 3 Newman St 1782 Law List / Middlesex Sessions (London Lives) Mr Martin solicitor for St Marylebone parish 3 Newman St 1784-88 3 Newman St 1789-98 / SunFire 1790 Thomas Martin gent 4 Newman St / Boyle's 1792 Martin 4 Newman St 1794 Martin & Whishaw attorneys 4 Newman St 1798 Thomas Martin 4 Newman St / Thomas Martin & Hugh Whishaw attorneys 4 Newman St 1796 Law List / Thomas Martin attorney 4 Newman St 1802 Law List, not in 1808 or later Law Lists but Boyle's Court Guide 1813-15 Thomas Martin atty 24 London St / 2.12.1784 Hugh Whishaw aged over 17 son of Mary Whishaw widow of Knutsford, Cheshire articled to William Turner of Warrington / Hugh Whishaw of Lincolns Inn Fields bur 24.9.1822 Hendon age 50 (56?)