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
In the 1861 census this address is at 117 Great Russell Street. I think this may be a private address.
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
1861/William Snewing/Licensed Victualler/42/Warwickshire/Census
1861/Mary Ann Snewing/Wife/38/St Pancras, Middlesex/Census
1861/William Snewing/Son, Saddler/18/Marylebone, Middlesex/Census
1861/Mary Snewing/Daughter, Milliner/16/Marylebone, Middlesex/Census
1861/Augustine Snewing/Son/4/St James, Middlesex/Census
1861/Catharine Snewing/Daughter/1/St Martins, Middlesex/Census
1861/Louisa Allibon/Servant/18/Marylebone, Middlesex/Census
1881/William Snewing/Retired Licensed Victualler/62/Brinklow, Warwick/Census
1881/Mary Snewing/Wife/59/London, Middlesex/Census
1881/Ann Snewing/Daughter, Barmaid/28/London, Middlesex/Census
1881/Catherine Snewing/Daughter/21/London, Middlesex/Census