Births Sep 1927 (>99%)
Smith Walter A Smith Watford 3a 1330
SMITH, WALTER ALBERT
GRO Reference: 1927 S Quarter in WATFORD Volume 03A Page 1330
Births Sep 1926 (>99%)
Smith Noah Smith Staines 3a 4
Assuming that the childrens' aunt's YOB and POB is correct, Most likley born as Smith, later Fletcher.
Births Dec 1921 (>99%)
Smith Matilda E Perriam Mile End 1c 558
Tenuous at best.