This birth record in 1956, a mere two years before his wife’s and in the county of their marriage and the only Jeremy N Jennings birth from 1948 to 1968, looks very much like his:

First name(s)         Jeremy N W
Last name             Jennings
Birth quarter         2
Birth year            1956
Mother's maiden name  Laver
District              Surrey North Western
County                Surrey
Country               England
Volume                5G
Page                  859
Record set            England & Wales Births 1837-2006

and he said he was two years older than her at marriage.
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Her probablyemarrige index, for which a certificate is being ordered to extract the validity of this guess:

First name(s)       Victoria M
Last name           Talbot
Marriage quarter    4
Marriage year       1983
Marriage Finder     Victoria M Talbot married one of these people
                    Jeremy N Jennings
Spouse's last name  Jennings
District            Oundle & Thrapston
County              Northamptonshire
Country             England
Volume              7
Page number         1989
Record set          England & Wales Marriages 1837-2005
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First note: her mother’s will gave enough information to confirm this marriage and thus their children.

This will arrived well before the marriage certificate was expected.  So there will be a further update.
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On the marriage certificate is this additional information:

Marr Place:  The Register Office, Oundle and Thrapstone, Northants
Cert No:     35
Marr. date:  1st Oct 1983

                   His                                Hers
                   ===                                ====
Name:          Jeremy Nicholas Wugrue(?) Jennings  Victoria Mary Talbot
Age:           27                                  25
Condition:     Previous marr. dissolved            Spinster
Profession:    Chartered Accountant                Estate Agent
Residence:     Flat 1, 12 Mornington Ave, London   Drayton House, Lowick
Father:        Robert Stanley Clement Jennings     Benjamin Robert Chetwynd Talbot
Father’s job:  Insurance Broker (ret’d)            Gentleman

Married at The Register Office by Certificate before C Cleland Superintendant Registrar, C Tindall Registrar

This marriage was solemnized between us, Jeremy Jennings, Vicky Talbot
in the presence of us, Katheringe Mishull-Beech(?), ? ?
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