I'm thinking something like that might have happened to trigger IS into killing Helen too. Maybe she didn't even know about the existing standing order, checked her account and thought WTF is that? and confronted him. I had thought that maybe she caught him trying to increase the amount but I think timewise that might be later than the time police think Helen died.
Not sure if they ever accessed the other ipad. I know there was something in the news about Apple generally being unhelpful when it comes to helping police access locked devices. I also wonder if police were ever able to access his deleted computer info or phone records for the phone he claims to have lost.He was certainly tried to hide something from them
Where are all these computer hackers when you need one. As the police are known to use crims for info, surely they could lay their hand on a cyber hacker or two.