There's a different vibe in the air as I walked around Olympic Park on Friday.

There's the inevitable feeling that the world's biggest party is about to end. Hundreds of thousands here and throughout the London metropolitan area would like to keep the fun times rolling for, say, another 10 days or so.

People enjoy lingering on a lazy Saturday morning, an extra cup of tea, one more serving of ice cream, 10 more minutes speaking on the phone with their best friend.