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 early name is the Royal Oak until at least 1849; Great Earl street is renamed Earlham street
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
Royal Oak :
1839/John Higgs/../../../Pigots Directory
1842/Dan Dismore/../../../Robsons Directory
1848/James Clark../../../Post Office Directory
November 1848/James Clark/Outgoing Licensee/../../Era
November 1848/Elizabeth Garden/Incoming Licensee/../../Era
August 1849/Elizabeth Garden/Outgoing Licensee/../../Era
August 1849/Thomas Davies/Incoming Licensee/../../Era
Napoleon III :
1851/James Skeggs/Licensed Victualler/35/Middlesex/Census
1851/Eliza Skeggs/Wife/38/Middlesex/Census
1851/James William Skeggs/Son/10/Middlesex/Census
1851/George Skeggs/Son/8/Middlesex/Census
1851/Eliza Skeggs/Daughter/6/Middlesex/Census
1851/Harriet Skeggs/Daughter/5/Middlesex/Census
1851/Mary Ann Skeggs/Daughter/3/Middlesex/Census
1851/Maria Allen/Niece/13/Middlesex/Census
Morning Advertiser 23 April 1851 - Licence transfers
Royal Oak, Great Earl street, James Skeggs to John Haywardy
1861/Thomas De Pledge/Licensed Victualler/50/Yorkshire/Census ***
1861/Eleanor De Pledge/Wife/43/Warwickshire/Census
1861/Mary Ann Duggan/Step Daughter/7/Middlesex/Census
1861/Fredk De Pledge/Son/6 months/Middlesex/Census
1861/Michael Thos Duggan/Stepson/2/Middlesex/Census
1861/Lucy Sarah Hurst/Barmaid/28/Middlesex/Census
1861/Helen Whooley/Housmaid/15/Middlesex/Census
1861/Jas Bassett/Pot Man/29/Middlesex/Census
January 1862/Thomas Depledge/Outgoing Licensee/../../Era
January 1862/Edmund George Hartley/Incoming Licensee/../../Era
October 1865/John Phipps Sinclair/Outgoing Licensee/../../Era Newspaper
October 1865/John Underwood/Incoming Licensee/../../Era Newspaper
February 1866/John Underwood/Outgoing Licensee/../../Era
February 1866/Edwin Lewis Ford/Incoming Licensee/../../Era
1869/Frederick Pritchard/../../../Post Office Directory