Whilst regrettable the delay was about 30 mins and NATS induced delays are on average well below historic levels and well below its own target. Unite has more effect on schedules.
The one is a million years prediction (if such a prediction ever existed) is not for events like this but rather for very major events like loss for days or for both radar and voice going down simultaneously. That has never happened as far as I am aware.
Mr Barron has one week left only. Software failures are nothing to do with him.