Based only on known info above,
Harry James Tucker 12.2.1913-11.11.1991 married Nora Fishwick 23.9.1911-2005. Appear together in 1939 register with one redacted entry below.
A Tucker/Fishwick son born sq 1938 Plymouth, matches christian name of Philomena's husband.
Marriage of said son 1963 Stepney has wife with 2 forenames, P K or K P.
2002 electoral register in Essex has P K Tucker with J Tucker
There are several Tucker/H***** births in Essex who are probable children.
SS