Many accurate 1921 census transcriptions have already been added to the pub history site, including London, and parts of Middlesex.
Rotherhithe index
Historical London public houses, Taverns, Inns, Beer Houses and Hotels.
The following entries are in this format:
Residents at this address.
1822/John Betts/Sailors Return, Love lane/../../Petty Sessions
1825/James Clarke/Sailors Return, Love lane/../../Petty Sessions
1826/James Clarke/Sailors Return, Love lane/../../Petty Sessions