Several high-profile witnesses called as Home Affairs Committee announces two evidence sessions after Games

A host of personalities responsible for delivering security for the London Olympic Games are set to face tough questions in a wash-up session before MPs.

Members of the Home Affairs Select Committee are poised to take evidence from witnesses including Nick Buckles, the Chief Executive of G4S, Home Secretary Theresa May, and AC Chris Alison, the National Olympic Security Co-ordinator.

During two hearings, which will take place on September 4 and 11, the committee will also see appearances from Dame Helen Ghosh, Permanent Secretary at the Home Office, Stephen Greenhalgh, London’s Deputy Mayor for Policing and Crime and Bernard Hogan-Howe, the Metropolitan Police Commissioner.

Brian Moore, Head of the UK Border Force and a former Wiltshire chief constable and Charles Farr, Director, Office for Security and Counter-Terrorism have also been called.

The announcement follows the appearance of Mr Buckles and Ian Horseman-Sewell, Account Director for the G4S Olympic contract, on July 17.

Both were grilled during a highly-charged hearing after G4S revealed that it could not provide around 3,500 of the 10,400 security personnel it had originally promised as part of a government contract for the 2012 Games.

In accepting the situation was “a shambles”, Mr Buckles admitted he was also unable to tell the committee how many G4S staff would report for duty on the first day of the Games

During the meeting, MPs heard that the company’s share price had decreased by 15 per cent since the revelations came to light and that it is set to lose an estimated £50m.