Many accurate 1921 census transcriptions have already been added to the pub history site, including London, and parts of Middlesex.
Bethnal Green pub history index
The compensation authority suggests it is an ante-1869 beer house.
Historical London public houses, Taverns, Inns, Beer Houses and Hotels.
Residents at this address.
1891/Mrs Mary A Newman/Beer Retailer/../../Post Office Directory
1895/Mrs Mary A. Newman/beer retailer/../../Post Office Directory *
1899/Mrs Mary A Newman/Beer Retailer/../../Post Office Directory
1901/Mary A Newman/Beer Retailer, Widow/53/St Georges East, London/Census
1901/Robert Newman/Son, Filer Tool making (Steel)/19/St Georges East, London/Census
1910/Mrs Jeanne Caroline Steening/Beer Retailer/../../Post Office Directory
1911/James R Ashworth/Beer Retailer/48/Newchurch, Rollindale/Census
1911/Mary E Ashworth/Wife/49/Burnely, Lancashire/Census
London Evening Standard 03 July 1912
Licensing Act 1904 Notice of principal meeting to discuss by the Compensation authority on 3rd July 1912
Britannia, 54 Wadeson street, Bethnal Green, Beer on (ante 1869), James Robert Ashworth
* Provided By Ewan