Hi,
In the "London, England, Electoral Registers, 1832-1965" I can see Ada S M HARRIS, Henry R HARRIS and sometimes William H HARRIS living at 14 Chalcroft Road, Lewisham between 1945 and 1956, after this Ada is on her own in 1957 and with William H HARRIS in 1958 and 1959, then on her own until 1964.
The "England & Wales, National Probate Calendar (Index of Wills and Administrations), 1858-1966" has,
Ada Susan Matilde HARRIS of 14 Chalcroft Road London E.13 died 23 April 1965 at Grove Park Hospital London S.E.12 Probate London 8 June to William Henry HARRIS petrol station manager £1261
Oops got to go now, late for dinner
Regards,
Daisy