Always thought the ingenious run on London to New York was the guy at the start point (top of Post Office Tower) with nothing, no money or ticket. He went down, asked a garage if he could wash a car, with the money earned he phoned round from a public telephone and got various sponsorships and commissions, enough to buy a ticket (at 1969 walk-up prices) to New York.
Was possibly all arranged beforehand, including his BBC coverage, but nevertheless quite clever.