Many accurate 1921 census transcriptions have already been added to the pub history site, including London, and parts of Middlesex.
St Clement Danes pub history index
The List of Masonic Lodges of 1740 - 1755 note that a masonic lodge met at the Three Tuns, Houghton street, Clare market with a constitution date of November 4th 1740.
The Three Tuns, Clements Inn passage in the 1847 license transfer. The name of the pub changes for a while to the Clock House, certainly in 1899
Historical London public houses, Taverns, Inns, Beer Houses and Hotels.
Three Tuns, 13 & 14 Houghton Street WC2
Residents at this address.
1805/Daniel O'Brian, Three Tuns, Houghton street, Clare market/../../Holdens Directory
In 1819, the poll book lists William Jones as a vintner at 41 Houghton street (named the Three Tuns)
1829/E Whelpdale/../../../Robsons Directory
1833-34/William Morant/../../../Pigots Directory
1836/Lewis Garrett/../../../Pigots Directory
1839/Jos Ashford/../../../Pigots Directory
1841/R Cooper/../../../Kellys Directory
February 1847/Wm Knight/Outgoing Licensee/../../Era
February 1847/Mr H Matthew/Incoming Licensee/../../Era
1848/Henry Mathews/../../../Post Office Directory
June 1849/George Watkins/Outgoing Licensee/../../Era
June 1849/William Fitch/Incoming Licensee/../../Era
1851/William Fitch/../../../Kellys Directory
February 1851/William Fitch/Outgoing Licensee/../../Era Newspaper
February 1851/John Gostwick/Incoming Licensee/../../Era Newspaper
1851/John Gostwick/Licensed Victualler/47/Ickworth, Suffolk/Census
1851/Susanna Gostwick/Wife/25/Thurlow, Suffolk/Census
1851/John Gostwick/Daughter/1 month/St Clements Danes, Middlesex/Census
1851/Maria Gostwick/Niece/19/Marylebone, Middlesex/Census
1851/Marian Gostwick/Niece/13/Marylebone, Middlesex/Census
1851/Eleanor Seagroves/Barmaid/20/Clerkenwell, Middlesex/Census
1851/Mary Ann Picket/House Servant/21/Kensington, Middlesex/Census
1853/John Goswick/../../../Post Office Directory
October 1857/James Sharply Craggs/Outgoing Licensee/../../Era
October 1857/James Cossins/Incoming Licensee/../../Era
March 1862/Nicholas Lane Jackson/Outgoing Licensee/../../Era
March 1862/Richard Freestone/Incoming Licensee/../../Era
March 1864/Richard Freeston/Outgoing Licensee/../../Era Newspaper
March 1864/William Younger Lang/Incoming Licensee/../../Era Newspaper
1899/George Thomas Wood/Clock House/../../Post Office Directory
1910/Thomas George Wood/../../../Post Office Directory
1921/A M Kempgee/../../../Post Office Directory
1944/Copes taverns Ltd/../../../Post Office Directory