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.
Many of the Beer Retailers in 1895 (usually better known as Publicans) are very important in the fact that many formed the modern Public House as we now know it; whilst others were the modern equivalent of the Off Licence.