Many accurate 1921 census transcriptions have already been added to the pub history site, including London, and parts of Middlesex.
Kensington pub index
This is named in the 1851 census and not far from the Duke of Richmond. I do not believe they are the same address.
A listing of historical London public houses, Taverns, Inns, Beer Houses and Hotels in Kensington, London.
Residents at this address
1848/Cornelius Churchill, Beer Retailer, High Street,
Kensington Gravel Pits/../../Post Office Directory
1851/Cornelius Churchill/Beer Seller/39/Borough, Surrey/Census
1851/Isabella Churchill/Wife/34/Brompton, Middlesex/Census