I looked at 1939 register but due to copyright cant post details here.
Death Reg 1951 has him born 1891 which agrees with above.
I havent find William in 1911 Census but in 1901 he is with Parents in Bradford;
Henry Towler, 21 (31 on image), Railway Engine Stoker, born Keighley
Jessie Towler, 28, born Great Wakering, Essex,
William H Towler, 10*****
Janie Towler, 8
Robert Towler, 6
Margaret Towler, 4
All children born Bradford
1891 Census
Henry Towler, 21
H J B Towler, 19
William Hy Towler, 3/12
Samuel Rawlings, 28
Sarah Jane Towler, 38
Martha Ellen Towler, 11
John Wm Towler, 7
Rose Sophia Thompson, 25
William Sonday, 27
Alfred Anstine, 29
James Broadfoot, 28
They married Bradford 21 Sep 1890;
Harries (Harriet) Jessie Bailey REDMAN, Father WILLIAM a Soldier (deceased), Sgt Royal Horse Artillery
Henry TOWLER, Locomotive Cleaner, Father JOHN a Policeman