The countdown's begun for the opening ceremony of the London 2012 Olympics, which starts at 9 o'clock.

A worldwide TV audience of a billion people is expected tonight.

We know cyclist Sir Chris Hoy will carry the British flag into the stadium, but it's now yet clear who will light the Olympic flame.

Sir Roger Bannister - the first man to run a four minute mile - and rower Sir Steve Redgrave - are the favourites.