I read this thread as it was happening and its interesting that suddenly I have an 'inmate'!
It's a death certificate for a 40 year old woman. The informant is John BELL, inmate, of the same street. The family had a son called John, but he would have been 12 years old when his mother died. I'm assuming that even if he'd been older it would have been unusual to refer to himself as an inmate instead of son? More likely that this man was father or brother to her husband lodging with the family?