His birth index:

First name(s)         John M
Last name             Boyd-Carpenter
Birth quarter         3
Birth year            1928
Mother's maiden name  Berens
District              Upton on Severn
County                Worcestershire
Country               England
Volume                6C
Page                  233
Record set            England & Wales Births 1837-2006
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In 1939 he was at Christ’s Hospital School.

In June 1953 he went to Tanganyka. He said he did farming.
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His death index:

First name(s)               John Mark
Last name                   Boyd-Carpenter
Gender                      Male
Birth day                   8
Birth month                 6
Birth year                  1928
Death quarter               2
Death year                  1996
District                    Chelmsford
District number             4681C
Register number             C5G
Entry number                226
Date of registration mm/yy  0496
County                      Essex
Country                     England
Record set                  England & Wales Deaths 1837-2007

No will found
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From his mother’s will he had a daughter who, in 1992, was called Tracey Yvonne Rennie and was said to have children.  But no birth can be found with the name Tracey Yvonne B-C, or Rennie.  Nor can a marriage be found between a ‘Tracey Yvonne …’ and a chap surnamed Rennie.  In FindMyPast’s Electoral Rolls there are 23 ‘Tracey Rennie’ voters, one of whom was within 50 miles of Kent in 2010-11 and living at Crawley, West Sussex.  Most of the Rennies on this file were from Scotland.

I cannot make any further progress with this search for the descendants of Benita Dorothy Barham née Berens.
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