A DILIGENT soldier on Olympic security duty stopped David Cameron yesterday — demanding to see his papers.

The PM praised the squaddie for being “on his marks” as he walked to Downing Street after using the London Underground to visit the Olympic Park in Stratford.

Mr Cameron told ITV London Tonight the Tube was “pretty good”.

But he added: “I was stopped going down Whitehall by a soldier. I didn’t have my papers.”

He added: “People said London would be gridlocked today and it wasn’t. The transport system has coped.”

Organisers have turned off some of the Olympic road lanes reserved for bigwigs because officials are travelling by public transport, London Mayor Boris Johnson revealed.

He said even International Olympic Committee president Jacques Rogge took the Docklands Light Railway instead of a car.