1901 census RG13 527 folio 129
26 Mornington Road Deptford St Paul London
Charles A Smith 24 Deptford Head Married Milk Carrier
Harriett Smith 21 Snape Mt Wickham, Suffolk, Wife Married
Harriett A Smith 8 mths Deptford Daughter
The likeliest birth registration looks to be this one
Births Dec 1907
SMITH Ernest Leslie Camberwell 1d 916
but Smith is a common surname and there are other Ernest Leslies.
Regards
Valda