His birth index:

First name(s)         OLIVER
Last name             PENROSE
Birth year            1929
Birth quarter         3
Mother's maiden name  Leathes
District              Marylebone
County                London
Country               England
Volume                1A
Page                  587
Record set            England & Wales Births 1837-2006
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These are the only Penrose children born with a mother’s maiden name of Dilley and within 20 years of their marriage:

Last name   First name(s)   Year Of Birth   Year Of Death   Year   Location
Penrose     Peter           1959            —               1959   Marylebone, London
Penrose     Lucy R          1960            —               1960   Pancras, London
Penrose     Martin S        1965            —               1965   St. Pancras, London
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This is the only marriage of any Oliver Penrose from 1946, when he would have been 16 to 2005 when the marriage records on the internet cease and there were no other Oliver Penroses born in England and Wales until 1973 so this is high degree oc certainty that this is his marriage:

First name(s)       OLIVER
Last name           PENROSE
Marriage quarter    4
Marriage year       1953
MarriageFinder      OLIVER PENROSE married one of these people
                    Joan L Dilley
Spouse's last name  Dilley
District            Hendon
County              Middlesex
Country             England
Volume              5E
Page number         829
Record set          England & Wales Marriages 1837-2005
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