His birth date (presumably from his death certificate?) is a year out!
Births, June qtr 1918
Bromley district vol 2a, page 863
Coppard, Horace Mother's maiden name: Weedon
Potential sibling births?
March qtr 1914
Bromley district vol 2a, page 1118
Coppard, John Mother's maiden name: Weeden
September qtr 1923
Bromley district vol 2a, page 1000
Coppard, Irene Mother's maiden name: Weeden
Parents marriage?
September qtr 1909
Bromley district vol 2a, page 1205
Coppard, Frederick Henry
Weeden, Ethel