Olive's birth:
March qtr 1898
Hereford Registration District vol 6a, page 473
Preece, Olive Harriet
The new GRO Index Search gives Mother's Maiden Names for nearly all births from 1837 to 1915. So:
PREECE, OLIVE HARRIET (Mother's Maiden Name:) COTTERELL
GRO Reference: 1898 M Quarter in HEREFORD Volume 06A Page 473
Also:
PREECE, ALBERT HENRY COTTERELL
GRO Reference: 1893 D Quarter in HEREFORD Volume 06A Page 458
PREECE, GERTRUDE ALICE COTTRILL
GRO Reference: 1891 S Quarter in HEREFORD Volume 06A Page 457
PREECE, ARTHUR ROSSOR COTTRELE
GRO Reference: 1887 J Quarter in HEREFORD Volume 06A Page 469
PREECE, EDWARD JAMES COTTERELL
GRO Reference: 1889 D Quarter in HEREFORD Volume 06A Page 465
All that points to this marriage:
September qtr 1886
Hereford Registration District vol 6a, page 813
Preece, James
Cotterell, Priscilla
(but you need to evidence to back this up. Censuses?)