The Countdown Clock on Trafalgar Square in central London ticks over to show just 200 days until 4,200 athletes from over 140 countries will be gathering for the largest Paralympic Games ever.

The London 2012 Organising Committee today announced that the under 16s Volunteer Performer Cast for the Olympic and Paralympic Ceremonies will be selected from schools in the six east London Host Boroughs.<br/><br/>Danny Boyle, Olympic Games Opening Ceremony Artistic Director, recently paid a visit to Colegrave Primary School in Newham, one of the <a href="http://getset.london2012.com/en/home">Get Set </a>schools selected to audition for the London 2012 Ceremonies.<br/><br/><br/>

Sir Chris Hoy comes from behind to win keirin gold in dramatic fashion at the UCI Track Cycling World Cup, a London 2012 test event at the Velodrome.

The first orientation training event for 10,000 London 2012 Games Maker volunteers and Games-time employees took place this morning at Wembley Arena in London. <br/><br/>The event was the first of six national orientation events on 4, 5 and 18 February which will form the biggest London 2012 events outside of the Games this year.

Sir Chris Hoy wins sprint gold at the UCI Track Cycling World Cup at the Olympic Velodrome

Aerial view looking west towards the Olympic Stadium, the Aquatics Centre, Water Polo Arena and The Orbit.

Aerial view of the Olympic Stadium and warm-up track.

Aerial view looking south west with Olympic and Paralympic Village in the foreground.

Aerial view looking south showing the Olympic Stadium, Aquatics Centre, Water Polo Arena and the Orbit.