It failures
A word of caution:I wouldn't automatically hit the "outsourcing" button here. Lots of core systems remain domestically controlled. RBS was a classic example of this. As with any aviation incident I'd counsel against jumping to conclusions.
That said, there is far less answerability in the banking industry than in aviation. Time, maybe, to treat an IT outage as a transport safety issue with a full published enquiry? I think so, and would urge the same scrutiny on other industries.
I speak from the perspective of one with over thirty years experience on very large scale critical systems. I may even be part of the problem.