His birth index:

First name(s)         David J C
Last name             Berens
Birth quarter         4
Birth year            1939
Mother's maiden name  Mellard
District              Bromley
County                Kent
Country               England
Volume                2A
Page                  1703
Record set            England & Wales Births 1837-2006
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He and Janet, from a search for Berens births with a mother’s maiden name of Balfour and between 1963 and 1983, had four children:

1. Archibald J R      1965  Marylebone
2. Emily Jane         1967  Marylebone
3. Jasper Luke        1970  Weymouth
4. Henrietta Cecilia  1982  Lambeth
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In his wife’s will she states that he was known to her and his friends as ‘Henry’ and so referred to him in later clauses of her will.
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In 2021 he was living at his mother’s old house, from the electoral Roll:

First name(s)      David J C
Last name          Berens
Year               2002-21
Street             Holt End Lane
Town               Alton
County             Hampshire
Country            England
Postcode           GU34 5LE
Address            Yew Tree Cottage, Holt End Lane, Alton, Hampshire, GU34 5LE
District           Alton
Occupancy (years)  18
Other occupants    Henrietta Berens, Janet Berens
Electoral rolls    2002, 2003, 2004, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021
Record set         UK Electoral Registers & Companies House Directors
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Their marriage index:

First name(s)       David J C
Last name           Berens
Marriage quarter    4
Marriage year       1963
MarriageFinder      David J C Berens married one of these people
                    Janet R Balfour
Spouse's last name  Balfour
District            Chelsea
County              London
Country             England
Volume              5C
Page number         455
Record set          England & Wales Marriages 1837-2005
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