Thank you, its certainly a curly one. From all of your helpful hints, I have sent off a copy of the index to the GRO for advice. I had previously reported the omission to them, but was told their records were correct and no amendment necessary.
I will also order the Atkinson birth certificate too.
The surname shown in all census from 1881 to 1911 is William Common, giving his age estimated to 1853, and his birth shown as Monkwearmouth or Sunderland County Durham.
I have not found him on any census before 1881 .
On his marriage to Jane Ann Wilson on 1st July 1876 he is shown as William Common aged 22 Glassman, and his father William Common, Boilersmith.
Perhaps the Atkinson mentioned may be his mother’s name.
Definitely a puzzle.
Thanks for all the helpful ideas.
Eileen