I still can't find them either but have found another family tree with later children which may or may not help
Sidney Elliot Smith 1914 Carlisle - birth registration is Smith with mothers maiden name Elliott
Louie Smith 15 Sep 1924 Southport
and 7 more some of which are not listed as may still be living
Not sure if getting a birth for one of the children would give any clues about Drusilla
