Jane Pearce is the wife of MI5 agent Harry Pearce. In Harry's Diary we find out that the two first met at Oxford where they started out as friends. ane knew about Harry's past career in the army but she didn't know that he had recently applied and been accepted into MI5 until just after she married Harry on the 15th of June 1977. (Source: Harry's Diary)
When Harry and Jane moved to Belfast so that Harry could work for Section A, after he first joining MI5, Jane worked as a English teacher, teaching English in the local school.