Just my opinion - I don't think the things PA mentioned about NB being organised that morning, or more organised (can't remember what he said). NB works in sales, she may have had a good few days in the office, feeling upbeat, whatever. If I have a good week, I sometimes go the extra mile in the morning, maybe do a quick tidy up as the kettle boils, or bring the empty milk bottles out, whatever. I personally think that something has happened, an altercation, and its gone horribly wrong and a perpetrator has panicked and removed NB from the area and perhaps put the phone on the bench. I think somebody local, not planned, not a sex crime, just something that went really badly wrong. I hope I am wrong, and again, just opinion. Doing a runner would be a such a big move, and then having to see the endless press coverage, I think NB would cave in, even if she has not committed a crime by going missing. If we assumed that her relationship with PA was on the rocks (no evidence, and doesn't seem likely) to leave ones children behind is something that very few women would do, even mothers with serious addiction problems don't want to leave their children.