In the July to September 1932 birth index, James C. Symondson, mother’s maiden name Fitzgerald, Marylebone, Greater London, volume 1a, page 627.
[It would seem either the Terence was omitted on the birth certificate or added later]

In the 1939 England and Wales Register
17 Benets Road, Hornchurch, Essex
1. Alfred S. Symondson, born February 7, 1895, married, temporary postman
2. Helen J. Symondson, born April 2, 1907, married, unpaid domestic duties
[later her name is shown as Ellen Josephine]
3. Record officially closed
4. Terence C. J. Symondson, born August 13, 1932, single,
5. Brenda M. Symondson, born June 3, 1934, single
[Later her married name Hall is inserted.]

In the July to September 1955 marriage index Terence J. C. Symondson and Doreen Archer, Romford Essex, volume5a, page 1428

UK Outward Passenger Lists
Departed London, England March 4 1959 on the Orontes destination Melbourne, Australia
Mr T.J.C. Symondson, born August 13 1932, address in UK 3 Holme Road, Hornchurch, Essex, window dresser, country of intended future residence Australia
Mrs. D. Symondson, born October 10 1934, wife,

Australia Electoral Rolls 1968
4 Bain-terrace, Launceston West, Bass, Tasmania
Doreen Symondson, home duties
Terence Symondson, display manager

In the December 1993 death index Terence James C. Symondson, born August 13 1932, died age 61, Bury St. Edmunds, Suffolk, register A11D, district 7421A

From Findagrave.com
Terence J. C. Symondson
born 1932
died 1993
buried All Saints Churchyard, Lawshall, Babergh District, Suffolk