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An bus drives past St Mary's Hospital where Catherine, Duchess of Cambridge is due to give birth.

For the time being, the door is guarded by a police officer who is rapidly becoming the most filmed man on the planet.

Occasionally he breaks his vigil to let a pregnant woman into the building, as the hospital continues the day-to-day business of treating less high-profile patients.

International correspondents pad out the time by interviewing passers-by and, as a last resort, one another.

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Shipped in from Belgium, Christophe Giltay, a senior reporter from RTL-TVI, is "following it all from a distance".

"You take in the ambiance and see how your colleagues are getting along. It's a right royal free-for-all," he said.

He drew parallels with the media scrum outside the Pretoria hospital where the frail former South African president Nelson Mandela is being treated.

In the knowledge that "the world has pretty much covered it all already", the Belgian tries to "find original angles".

"We're looking. Maybe something on the name. Yes, we're looking," he said, before scaling a metal ladder to deliver his report.

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From high up in a forest of aluminum, he has a good view of his Polish colleague trying for the 10th time to secure a moving shot in front of the hospital.

After nearly being run over by a passing car, the Pole finally captures it and can loosen his tie in the heat. "What a mess! But we did it," he said.

A hundred meters away, the satellite vans are parked up, ready to whirr into life at any moment.

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