Merchant Navy - Arthur Parker

[Peter Hyde]

Hello - I am trying to trace the following man:
Arthur Parker (no middle name on birth or marriage certs
DoB:  18/Aug/1900 - Deptford
Military history:  Middlesex Regiment (no service record found - probably burned in the blitz)
On marriage cert to Florence Ann Blunden on 16/5/1920 he is a 'seaman'
On death cert of his wife on 1/9/1925 he is listed as 'seaman in merchant service'
There is no record that I can find of any children, employment, re-marriage or death.
I have tried Ancestry, FindMyPast,etc
He seems to have disappeared after his wife's death
Any suggestions would be most welcome
Thanks
PeterH
South Australia