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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Bitcoins tend not to be very secure, says Richard Booth, a consultant at RSA, a cyber-security firm.

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After negotiating the labyrinth of security, coat checks and corridors, we were ushered into three seats in the front row of Gallery booth No. 7, less than two feet behind the C-SPAN cameras installed there to monitor the proceedings.

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