lol!!
I don't know if you had seen the baptism for James and Elizabeth's eldest two, Catherine and James (surname Benj!!)?
http://search.ancestry.co.uk/iexec/?...rc=&pid=470366
Catherine's says she was born 16th Aug 1852 and was bap 13th March 1855, but there's apparently no birth reg for her unless this is her:
Births Sep 1852
Beens Catherine St. Giles 1b 308
Whilst Beens does seem to be a real name there are no further registrations for a Catherine - just this birth.
I'm just trying to force James and Elizabeth together back as far as 1851! lol