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
The address is Smart buildings in the 1841 census
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
1841/James Furzeman/Victualler/40/../Census
1841/Amelia Furzeman/../30/../Census
..
1842/James Furzman/../../../Robsons Directory
1843/James Furzman/../../../Robsons Directory
1851/Daniel Dismore, Kings Arms, 11 Smarts buildings, Holborn/../../Kellys
Directory
1856/Daniel Dismore, Kings Arms, Smarts buildings, Holborn/../../Post Office
Directory
September 1860/Henry Thomas Lloyd/Outgoing Licensee/../../Era
September 1860/John Clark/Incoming Licensee/../../Era
1861/John Clark/Licensed Victualler/33/London, Middlesex/Census
1861/Caroline Clark/Wife/30/Holt, Dorset/Census
1861/John Clark/Son/4/London, Middlesex/Census
1861/George Clark/Son/4 months/London, Middlesex/Census
1861/Jane Holland/Visitor/19/Holt, Dorset/Census
1862/John Clark, Kings Arms, Smarts buildings, Holborn/../../Licensed Victuallers Association
October 1865/Joseph Rowe/Outgoing Licensee/../../Era Newspaper
October 1865/Maurice Alexander McGlashan/Incoming Licensee/../../Era
Newspaper
1869/Harry Gill/../../../Post Office Directory
September 1870/Harry Gill/Outgoing Licensee/../../Era Newspaper
September 1870/James Burrows/Incoming Licensee/../../Era Newspaper
1871/James Burrows/Publican/51/Iken, Suffolk/Census
1871/Susan Burrows/Son, Coachman/44/Ware, Hertfordshire/Census
1871/William Burrows/Son/17/Bloomsbury, Middlesex/Census
1871/Ellen Burrows/Daughter, Barmaid/15/Bloomsbury, Middlesex/Census
1871/Amelia Maria Burrows/Daughter/11/Bloomsbury, Middlesex/Census
1871/Sarah Emily Burrows/Daughter/10/Bloomsbury, Middlesex/Census
1871/Alice Jessica Burrows/Daughter/2/Bloomsbury, Middlesex/Census
1871/Henry Ingram/Potman/32/Hereford, Herefordshire/Census
1873/James Burrows/../../../Holborn Petty Sessions
1874/James Burrows/../../../Holborn Petty Sessions
1875/James Burrows/../../../Holborn Petty Sessions
1876/James Burrows/../../../Holborn Petty Sessions
1877/James Burrows/../../../Holborn Petty Sessions