Bernadette,
It is a strange image, isn't it - there does seem to be something showing through...
As no doubt you are aware, the marriage of James and Ellen is in the IGI at the LDS site FamilySearch at:
http://www.familysearch.orgThere is also the christening of a daughter to James Turkwin and Ellen - Clara Credilla Turkwin, bap 11 Oct 1843, Rotherham, Yorkshire. This is one of those strange "I" batches, all female, and no source information (I wrote to the LDS asking for more information about these batches but did not receive a reply).
If you haven't already done so, it would surely be worth going to your nearest LDS Family History Centre and ordering in the film with the marriage of James and Ellen. Also there might be a film which could possibly include baptisms of more of their children. Usually the parish registers do not contain a lot of information. But sometimes you can be lucky!!
JAP