The Leveson inquiry will hear today from Detective Chief Inspector Brendan Gilmour. DCI Gilmour worked on the Metropolitan Police's Operation Glade, which looks into police corruption.
The temporary Assistant Chief Constable of Devon and Cornwall police, Russell Middleton will also give evidence. He was involved in Operation Reproof about an officer allegedly supplying private investigators with information from the police national computer.
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Guillier conceded a "severe defeat" defeat to his supporters as the result came in.
The outage struck Hartfield-Jackson Atlanta International Airport at around 1pm local time, stopping all outgoing flights.
It will be a chilly day for many parts with the highest temperatures, about 10 Celsius (50F) in the far northwest.