Jayand is correct. There's no point in trying to sweat yourself through a search facility into an Olympic venue when, to the rest of the world, "London" is the Olympics.
There's a completely unprotected massive shopping centre, with huge crowds, just a few steps from the main arena...............................................
Or Piccadilly Circus.......its all "London" and "London" IS the "the Olympics", as far as the 4 billion world audience is concerned.