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…