Cleaners on London Underground will go on strike today for 48 hours, in a row over an Olympic bonus payment.
Members of the Rail Maritime and Transport Union who are employed by private contractors will walk out at 5:30am.
They're set to mount picket lines outside tube stations in London - including Stratford, close to the Olympic park.
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.