Fifty feet away, an employee in uniform, perhaps a security guard, sat inside a glass booth shaped like a giant pill capsule.

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The young man retreated to a portable booth tucked away at the end of the security line and fetched a dogeared paperback copy of my book.

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It uses the London Information Centre in Leicester Square - the popular ticket booth - as its base and includes uniformed security staff to accompany people to licensed mini-cabs.

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