All a bit of a nightmare!
Alfred Seymour 1834-1894 (age at death 61,died Poplar).
Alfred's son Alfred Abraham Seymour (as CaroleW post) convinced me that his father was Alfred Abraham Seymour,who died in 1839,explaining the 1841 census where he is with Mary Ann Seymour .However his marriage certificate in 1855 states his father as William .??
As CaroleW post he is a cooks mate,a Royal Navy post explaining presumably why he is not in the 1851 or 1861 census.
Eliza Seymour (nee Flockton) 1835-?.
The marriage (in Hackney) certificate in 1855 states her father as James Flockton (a Fellowship Porter-interesting)
I cannot find them in the 1851 census ,and cannot find her in the 1861 census (maybe a missing census Eyesee),nor can I find her death record.
More help please.