As it happened: London 2012, one year to go

Key points

• Events marking a year to go until the opening ceremony of the 2012 Olympic Games are being held
• IOC president Jacques Rogge invited the world to London to celebrate the Games at an event in Trafalgar Square, and the design of the medals was revealed
• The Aquatics Centre in the Olympic Park in Stratford has been unveiled - Olympic hopeful Tom Daley made the first dive into the pool