An update, I looked on the 1851 census for Jane Chatfield and found her living at 20 Poland Street. Also at 20 Poland Street was William Dove. concertina maker, Born Great Baddow,essex,,, so jorose looks like you are right. I have looked for William on the 1851 before and not found him, but having Mary's mothers name it came straight up. William was in bankruptcy in 1852 in the London Gazette William Waring Dove ,late of 20 Poland Street.Oxford Street. Also there are two mentions of William Waring Dove in the concertina museum site, showing an example of his work.[with a label with address on]I think this just might be enough to prove a link. So thank you for your help, I will update if I find out any more. Must try and track Jane and her children now. John.