Do you bank with RBS? 600,000 customer payments fell into a black hole. 600,000 people aren't getting the money they expected, and in some cases, rely on.
RBS has form on this; they had a major outage in 2012.
If I banked with RBS, which I don't, or Natwest (affected by the same problem), I'd be changing my bank. If a bank can't even do this fundamental task, Then clearly, they are not "too big to fail", because they just failed.
Two days ago, the head of RBS, Ross McEwan, said "we have now built a lot of resilience back into the bank, which we're very proud of."