I would assume that the National Grid have done such an analysis and determined that it isn't worthwhile, seeing as how... they still employ a bloke to do the job!
I'm pretty cynical... I suspect the analysis was - do we allow the guy on duty watch East Enders and do his job after hours, and pay him a bit of overtime, or do we pend a lot of money for IT to come up with an automated solution that might not work th first time...
