Many accurate 1921 census transcriptions have already been added to the pub history site, including London, and parts of Middlesex. If you can contribute to the site, send me some details to Kevan, along with some description of the specific property.
St Giles pub history index
A listing of historical public houses, Taverns, Inns, Beer Houses and Hotels in St Giles in Fields, London. The St Giles in Fields , London listing uses information from census, Trade Directories and History to add licensees, bar staff, Lodgers and Visitors.
Residents at this address
1833-34/William Seares, George IV, 12 Portsmouth street, Lincolns Inn/../../Pigots Directory
1836/Frederick Heavens, George IV, 12 Portsmouth street, Lincolns Inn/../../Pigots Directory
1839/Walter Charles, George IV, 12 Portsmouth street, Lincolns Inn/../../Pigots Directory
1842/Charles Watler, George IV, Portsmouth street, Lincolns Inn/../../Robsons Directory