Many thanks for the information, but it is definitely a Mary Ann Fraser I am looking for with a Father called James. Despite her claiming to be born in Woolwich in later census, the only matches I found were for James an ex-soldier who had an Irish wife Mary, and a daughter Mary Ann born in Ireland while James was stationed there. After much research I am fairly confident that these are the right ones, but if I had found definite proof of a Mary Ann born in Woolwich in about 1844 with a Father called James then I would have to reassess matters. Unfortunately it is a case that not finding one does not mean that there isn't one.
Gunner