see Batemans Buildings in London Addresses dataset
Lancelot Powell ratebooks 8 Batemans Buildings 1778-1781 / there may have been two or more Lancelot (or Launcelot) Powells in London at this time, as birth dates given in the the baptisms of his children by Martha postdated his marriage to Susanna Turner, which didn't specify if he was bachelor or widower, also if there was only one person, he made abrupt career changes, from being a scholar at Westminster to a stationer's apprentice in 1769, and from being a printer in 1781 to being a tailor in 1787 / Harvey Powell bach of St Paul Covent Garden = St Geo Han Sq 1745 Ester Linall sp of St Martin i t Fields / Lancelot Powell son of Harvey & Esther bapt 20.4.1755 St Martin in the Fields / Launcelot son of Harvey Powell adm 22.2.1769 Westminster School, Kings Scholar 1769 age 14 / Lancelot Powell son of Harvey Powell apothecary Covent Garden appr 5.12.1769 to John Nicholls of Stationers Company / Lancelot Powell bach = St Geo Martyr Queen Sq 19.5.1776 Martha Martin sp botp banns wits James & Ann Price / Lancelot Powell of James St, St Martin i t Fields printer took admon of his father's estate (Harvey Powell widower died Dec 1780) London Consistory Court 21.1.1781 / Lancelot Powell = St Martin i t Fields 6.7.1786 Susanna Turner botp banns / SunFire 1787 Lancelot Powell taylor 16 White Horse Yard, Drury Lane / Elizabeth dau of Lancelot Powell & Martha bapt St Clements 1787 / Lancelot Powell taylor voted Hood 1788 White Horse Yard / Launcelot Powell ratebooks St Margaret 1789-1812 (at Bridge St 1791-1802, Manchester Buildings 1806-12) / Lancelot Powell taylor Bridge St coroners jury 1792 / Ann Precilla dau of Lancelot Powell & Martha bapt St Margaret Westmr 1792 / William Martin son of Lancelot Powell & Martha bapt St Margaret Westmr 1794 / Launcelot Powell tailor 15 Bridge St voted Fox & Horne Tooke 1796 / Launcelot Powell bur 14.10.1814 St Bride Fleet St age 59