Hi Melanie, I had always thought that Frances Elswood was the daug. of William Elswood & Frances Trenchard but I found out over the last few months that she was in fact the daug. of Clement Elswood & Frances (I think Allen) the information was sent to me by another Elswood researcher but unfortunatly I have lost a lot of my Emails when my hard drive went down at the begining of the year.
I do know that this Frances Elswood & Benjamin Chaffrey family tree is on Ancestry.com so you might find it interesting to have a look there.
At this time I have not managed to fit this side of the Elswood's into my tree at the moment but as Elswood is such an unusual name I am sure that they will be related some where down the line, let me know how you get on.