Labour leader Ed Miliband and the rest of the shadow cabinet have arrived at the Olympic park.
They will hold a meeting later in the aquatics centre.
G4S should be the first outfit on a Government blacklist of high-risk firms that have failed to deliver, MPs have said.
Transport for London has created a new version of the tube map, to celebrate the success of Team GB at the London Olympics.
Olympic hero Mo Farah has shown off the newborn twins who inspired him to double gold-winning victory - and finally revealed their names.