Think this is possibly the birthdate mentioned by OP it does not match his service number with Hilda as NOK.
Name T Coghlan
Birth Date 2 Dec 1889
Service Number 1461900
Rank Army Other Ranks, Discharges for 1939-1971
Additional Regiment Royal Artillery
Reference Number ADH001835378
I know nothing of Military, maybe his service number changed or it is not him. Also for discharges post 1939
Added 1939 gives his birth as 2 Dec 1889, I wonder did he rejoin for WW11. That would give a new service number?
Cas