"There were so many elements to Watergate that it's hard to pack them all in, " Woodward said.

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So, skittering over the hard-pack it has a tendency to rattle against a helmet's exterior, something which you can definitely hear in the video.

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"The likes of Tesco, Carrefour and Metro would see themselves as chasing hard in the pack behind Wal-Mart, " said Richard Lloyd-Owen, Deloitte's head of consumer business.

BBC: NEWS | Business | Wal-Mart three times rivals' size