Harriet was not divorced - the "D" stands for daughter to the head of house.
https://www.familysearch.org/ark:/61903/1:1:MWL7-WKTLondon, England, Electoral Registers, 1832-1965
Mary Raleigh Richardson Electoral Date 1918
Street Address 28 St. Ann's Vicarage
Ward or Division/Constituency Bermondsey and Bethnal Green
County or Borough Tower Hamlets, England
Mary Raleigh-Sj Richardson Electoral Date 1923
Ward or Division/Constituency City of Westminster
County or Borough Westminster, England
Mary Raleigh-Richardson SJ Electoral Date 1924
Street Address 6 Major
Ward or Division/Constituency City of Westminster
County or Borough Westminster, England
Mary Raleigh Richardson Electoral Date 1925
Street Address 22 Great Russell Street
Ward or Division/Constituency Holborn
County or Borough Camden, England
Kensington and Chelsea, London, England, Electoral Registers, 1889-1970
Mary Raleigh Richardson - Residence Date 1926
Residence Street Address 2 Oakley Street
Residence Borough Kensington and Chelsea
Residence Place London, England.
Mary Raleigh Richardson Residence Date 1927
Residence Street Address 2 Oakley Street
Residence Borough Kensington and Chelsea
Residence Place London, England
Mary Raleigh Richardson Residence Date 1928
Residence Street Address 59 Oakley Street
Residence Borough Kensington and Chelsea
Residence Place London, England
Mary Raleigh Richardson Residence Date 1929
Residence Street Address 59 Oakley Street
Residence Borough Kensington and Chelsea
Residence Place London, England
Mary Raleigh Richardson Residence Date 1930
Residence Street Address 59 Oakley Street
Residence Borough Kensington and Chelsea
Residence Place London, England
Mary Raleigh Richardson Residence Date 1931
Residence Street Address 443 Fulham Road
Residence Borough Kensington and Chelsea
Residence Place London, England
Mary Rayleigh Richardson Residence Date 1936
Residence Street Address 2 Oakley Street
Residence Borough Kensington and Chelsea
Residence Place London, England
Mary Rayleigh Richardson Residence Date 1937
Residence Street Address 2 Oakley Street
Residence Borough Kensington and Chelsea
Residence Place London, England
Sandra