I know single parents were demonised in the 1980s but I don't remember women being particularly more vulnerable financially than they are today as sahm. My mum worked, her friends worked. It wasn't unusual to have a career.
That said, I do believe Parkinson was capable of damaging the future career prospects of SK - he was, after all, the more powerful one in that relationship. I don't think it reflected at all well on her that she was willing to sleep with a married man for 12 years, but who knows what he said to her wrt his marriage.