The Serious Fraud Office (SFO) has said it appointed former security chief at the Palace of Westminster, Peter Mason CBE, to look into the data loss.
Mr Mason is said to have concluded that it was accidental, and made a number of recommendations which have all been accepted by the SFO.
More top news
Italians go to the polls in a referendum on Sunday which could spell the end of Matteo Renzi's reign as prime minister.
A thief who posed as a council worker snatched cash from an 86-year-old woman's pension book, the Met Police said.
Drivers in Scotland will be banned from smoking in cars where children are present from this week.