London 2012 has marked 100 days to go to the start of the Olympics by launching the slogan for the Games: "Inspire a generation."
A launch event at Kew Gardens in London also saw the unveiling of giant Olympic rings created by flowers which will be visible from flights arriving at Heathrow airport.
London 2012 chairman Sebastian Coe said: "With 100 days to go to the start of the Games, millions of people are getting ready to do the best work of their lives and welcome the world this summer. Expectations are high and we won't disappoint."
Organisers also announced that the Red Arrows - the RAF aerobatic team - will perform a flypast across the UK to mark the opening ceremony on July 27, flying over London 2012 live sites in Belfast, Cardiff, Edinburgh and London. There will be a total of 22 live sites in towns and cities with big screens.
IOC president Jacques Rogge said expectations were high but he was confident that London would deliver.
Mr Rogge said: "Organising the Olympics is a team effort and over the next hundred days, people from all walks of life and from all around the world will play their part in helping to make London 2012 a Games that will inspire a generation.
"From the athletes refining their technique, to the volunteers learning about their roles, to the torchbearers carrying the Olympic flame and the people supporting them as they go, each and every one of them is playing their part in making these a Games to remember.
"Around the world, the excitement is growing and expectations are high but I am confident that Britain and London will deliver a great sporting event and a warm welcome too."
It was also announced that 40 "Coubertin oak" trees are being planted at venues around the UK. The trees will be grown from acorns taken from an oak planted in 1890 during the visit of the founder of the modern Olympic movement, Pierre de Coubertin, to the Wenlock Olympian Games.
The oaks will be planted at Kew Gardens, William Brookes School in Much Wenlock, Shropshire, the Forestry Commission's National Arboretum, and at the UPS London Central Centre in Camden.