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.
Elstree includes Boreham Wood - Also check Aldenham
Directory of Pubs in the UK, historical public houses, Taverns, Inns, Beer Houses and Hotels in Hertfordshire .
|Artichoke, Elstree, Hertfordshire||Yes||Yes|
|Crown, 1 Shenley Road, Boreham Wood, Hertfordshire||Yes||Yes|
|Green Dragon, Elstree, Hertfordshire||No||Yes|
|Old Holly Bush, High Street, Elstree, Hertfordshire||Yes||Yes|
|Plough, High Street, Elstree, Hertfordshire||Yes||Yes|
|Red Lion, High Street, Elstree, Hertfordshire||No||Yes|
|Waggon & Horses, Watling Street, Medburn, Elstree, Hertfordshire||Yes||Yes|
|Wishing Well, Thai Star, 133-135 Shenley Road, Borehamwood, Hertfordshire WD6 1AH||Yes||Yes|