Hi Arranroots Tanja and anyone else following this
Thought I'd try Tanja's advice and try and find a birth record for one of the children on Ancestry, found a couple that could be John or Charles Smith, however there is a Charlotte A Smith, born Northampton Dec 1866 qtr, Vol 3b p69, which looks a very good bet so I shall order this one and see what it says. In the meantime if anyone has any more ideas feel free to post
Regards
Anthony