Jess Walker, who trains in Teddington, will be competing in the final of the women's K1 200m kayak contest later.
The competition starts at 10:14.
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.