That wasn't said, perhaps due to time constraints, but in the financial world most of the trading desks have a failsafe plan in place, such as distanced location from main place of business, parallel telecoms and computer systems ready at a moments notice to kick-in and keep the trading positions open etc. I'm sure that the employees of NATS did a sterling job to manage the disruptions and get things back on track (pun intended) however those responsible for contingency planning might want to have a rethink as to how such disruptions can be alleviated in the future.