There is a Sydney George Hall, born Crowland, on the 1911 census - but I am not allowed to tell you anything about 1911!
But:
Marriage September qtr 1907, Lambeth, Vol 1d, Page 665
Hall, Sydney George
Ounsworth, Annie
There are 3 Ethel's, born Crowland, on the 1911 census.
2 of them are single are are NOT called Hall!
The remaining Ethel is Ethel Mary Moyses.