Many accurate 1921 census transcriptions have already been added to the pub history site, including London, and parts of Middlesex.
Greenwich Index
It appears Ship Dock was somewhere near the top of King Street (now King William Walk) and Greenwich Church Street, presumably near the riverside. *
A listing of historical public houses, Taverns, Inns, Beer Houses and Hotels in Greenwich, London. The Greenwich, London listing uses information from census, Trade Directories and History to add licensees, bar staff, Lodgers and Visitors.
Residents at this address.
1805/Rob Cullerne/../../../Holden's Directory *
1823-24/Catherine Cullerne, Duke of Gloucester, Greenwich road/../../Pigot's
Directory *
* Provided By Ewan