Hi Beady,
Thank you for your thoughts and info. I have found a Richard and Elizabeth Atkinson living in Stickney in the censuses and there is a submitted baptism for one of their children on the IGI, which gives Elizabeth maiden surname as Butler; I realise of course this could be incorrect, but.....
I have considered that Richard and Eliza may not have married, or as GeoffE said that she could have been a widow when they married.
Unfortunately there are no details on children between a Sinclair Atkinson and Anne Graham, or indeed I cannot find them on censuses. There is a Anne Atkinson living in Boston on the censuses, no apparent husband and with children.
The possibilities are endless

Kath