I made a note of that 1881 census record ages ago as being the family I thought most likely to be his one. But I didn't have his fathers name, so I was never sure.
I also have a note for 1871, they were in Camberwell then.
I also have a baptism record I found for Henry John, parents Henry and Eliza, just in case they did turn out to be the right family
Name: Henry John Morgan
Record Type: Baptism
Baptism Date: 11 Jan 1863
Father's Name: Henry Morgan
Mother's name: Eliza Morgan
Parish or Poor Law Union: Islington St Mary
Borough: Islington
Register Type: Parish Registers
Sorry, I didn't meant to ignore your question, no I don't have his death certificate.