Her birth index:

First name(s)         SUSAN M
Last name             DEWHURST
Birth year            1936
Birth quarter         3
Mother's maiden name  Dewar
District              Westminster
County                London
Country               England
Volume                1A
Page                  544
Record set            England & Wales Births 1837-2006
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This looks very much like a marriage for her:

Surname   Forename  Spouse Surname  Spouse Forename  Year  Ref       RD Name
DEWHURST  SUSAN M   RANKIN          ALICK MICHAEL    1958  387/ 181  Perth

It was, as confirmed by her married surname in the will of her uncle John Powys Dewhurst.
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Because of the lack of mother’s maiden nmaes on the Scotland’s People indices, it is difficult to impossible to identify any children of theirs.  There are 1500 Rankin births from 1958 to 1978 so I immediately abandoned all such quests.
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Their marriage index:

Surname   Forename  Spouse Surname  Spouse Forename  Year  Ref       RD Name
DEWHURST  SUSAN M   RANKIN          ALICK MICHAEL    1958  387/ 181  Perth
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