Stephen Allison (1790/4-1853) is my brick wall, and I think I've reached the limits of what I can research within my own skill set.
The 1851 UK Census suggests he was born around 1794 in Norway, but his death certificate (1853, with age at death of 63) suggests 1790.
He was a mariner, which is what, I opine, brought him to the Docklands, eventually he worked in the Docks and then finally as an Umbrella/Parasol maker.
If he was born in Norway, his name was clearly an Anglicisation of something Norwegian, like Steffan/Sven Olsen, and with the patronymic system I understand that further research past a father of 'Ole' would be difficult.
What can I practically do to find out what his birth name might have been, and where he might have been born? Or is this a dead end?