London Tonight has discovered that a high security fence is being built around a gas plant in Hertfordshire. The plant is tucked away in woods.
It's believed the site supplies gas to north London and Stratford - including the Olympic park. Around one hundred workers are erecting a fence around the site.
Work will continue there for the next five months.
The National Grid said in a statement: "We carry out robust security in conjunction with the Government and LOCOG [The London 2012 Organising Committee]."
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.