Robsons 1832 directory index
This is the earliest street directory I have found so far which also includes pub history detail.
Drummond street, Euston square
Drummond street, Euston square is not listed in the 1832 street directory although it did exist at the time.
There are a number of streets in Euston square area missing.
Lion & Lamb, 1 Drummond street, Euston square
Royal George, 25 Drummond street, Euston square
Drummond Arms, 35 Drummond street, Euston square
Crown & Anchor, 71 Drummond street, Euston square