Before retirement I was a Computer power & environment specialist and carried out many Data Centre & Computer room surveys from small to large. One of the first questions asked was, how much per hour would the company loose if the room went down or would they still be in business. Only one company knew, Fidelity Finance in Tunbridge Wells, they had servers making over a million pounds an hour so the centre was perfect. Very rare. Visited an airlines data centre in a north London airport once, it was a total mess, running on the edge, if one aircon unit had failed the computers would have shut down due to exceeding temperature limits. Not a nice way to shut down, as machines just panic and crash leaving the software in a mess. I hope they have improved it since then. An example of a company that went under due to a system failure in their Slough date centre was Blackberry was not overnight but the begining of the end. Is BA on this slippery slope, I hope not but the cracks are staring to show.