2002: Nick Buckles is appointed chief executive of Securicor, one of the largest UK security firms
2004: Securicor and Group 4 Falck merge to form Group 4 Securicor (
G4S), with Lars Norby Johansen of Group 4 Falck as chief executive. Today the company is the world's third largest private employer (after Wal-Mart and Foxconn), with more than 657,000 staff worldwide.
2005: Buckles takes over from Johansen as CEO of G4S.
2007: G4S joins the FTSE 100 index
2008: Group turnover reaches almost £6bn – an increase of 22% from 2007
2010: Angolan deportee Jimmy Mubenga dies in October after being forcefully restrained by three G4S security guards on a British Airways flight.
No one was charged for Mubenga's death
2011: In March, G4S is granted the contract to provide security for the London 2012 Olympics.
11 July 2012: The Guardian reveals that
3,500 British troops would have to be drafted in to ensure security at the Games. G4S reveals it could lose £50m as a result.
16 July 2012: Buckles' future is cast into doubt by the G4S chairman, John Connolly. G4S staff fail to show up for training at Olympic team hotels in Manchester and the West Midlands. The Guardian reveals that officers from nine different
police forces are to be drafted in to make up for the shortfall.
17 July 2012: Buckles is grilled about his role in the affair by the home affairs select committee. He
tells MPs he is "deeply sorry" for the oversight but insists he is still the best person to ensure security demands are met by G4S.