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.
Clerkenwell pub history index
Historical London public houses, Taverns, Inns, Beer Houses and Hotels.
Residents at this address.
1841/Charles Clarke/brewer/../../Post Office Directory *
1851/Richard J. Steventon/Beer Retailer (Widower)/74/Westminster,
Middlesex/Census *
1851/Ellen Jane Steventon/Daughter/29/St Andrews Holborn, Middlesex/Census
1851/Octavious Steventon/Son, Clerk to Distillers/24/St Andrews Holborn,
Middlesex/Census
1851/Esther Joes/House Servant/54/Henley on Thames, Oxfordshire/Census
1856/Charles Clarke/brewer & beer retailer/../../Post Office Directory *
1869/Charles Clarke/brewer/../../Post Office Directory *
1882/Edward Cowley/brewer/../../Post Office Directory *
* Provided By Ewan