Thank you for looking this up for me.   Joseph and Jane were married (presumably) around 1847-1848, but I haven't found any records in the indexes for them.  
They also had a daughter, Elizabeth, at the end of 1851, also at St James Westminister, so it was a reasonably safe bet that they were there during the 1851 census.  I was hoping for this census entry to give me an idea of where Joseph and Jane were born.
Thanks
Leonie