London 2012's legacy plans have "raised the bar" for future Olympic hosts, International Olympic Committee (IOC) president Jacques Rogge said.
He is in Britain to get updates on Games preparations from Prime Minister David Cameron, Culture Secretary Jeremy Hunt, London 2012 chairman Lord Coe and sports minister Hugh Robertson as IOC inspectors begin their final three-day visit before the Games begin in July.
His Downing Street meeting with Mr Cameron includes an action plan from which both Government and organisers hope to secure long-term benefits from staging the Games in Stratford, east London.
Mr Rogge said: "London has raised the bar on how to deliver a lasting legacy.
"We can already see tangible results in the remarkable regeneration of east London.
"This great historical city has created a legacy blueprint for future Games hosts."
Mr Rogge will also meet 2000 Olympic heptathlon champion Denise Lewis, former Olympic sprinters Darren Campbell and Jason Gardener, plus double Paralympic swimming gold medallist Ellie Simmonds, who are the newly named ambassadors for the Sainsbury's School Games.
The Princess Royal and Mr Cameron will later host a Downing Street reception for youngsters who are involved in the event.
Up to 1,600 schoolchildren are competing in this multi-sport competition, which includes disability contests, with the finals taking place at the Olympic Park in May.
The success of the legacy plans is not guaranteed but the tricky issue has been "built into the DNA of London 2012", according to Mr Cameron as the Government also published its legacy blueprint, entitled Beyond 2012.