There are 8 Reginald C Tyler births on FindMyPast for England and Wales from 1905 to 1945, so no idea which might be his.

However a Reginald Charles died in Plymouth, where he and Phoebe were living, in 1996:

First name(s) REGINALD CHARLES
Last name TYLER
Gender Male
Birth day 31
Birth month 10
Birth year 1916
Death quarter 2
Death year 1996
District Plymouth
District number 4161E
Register number E51A
Entry number 271
Date of registration mm/yy 0596
County Devon
Country England
Record set England & Wales Deaths 1837-2007

The probate index shows a death date of 20 May 1996 but does not give the executor’s name, so I cannot be sure this was his death.  There are no other Reginald C Tyler entries on the probate index.
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Their marriage index:

First name(s) PHOEBE
Last name CAWTHORN
Marriage quarter 2
Marriage year 1984
Registration month 4
MarriageFinder™ PHOEBE CAWTHORN married
Reginald C Tyler
Spouse's last name Tyler
District Plymouth
County Devon
Country England
Volume 21
Page 1787
Record set England & Wales Marriages 1837-2005
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