When a reporter asks a question, the expert wants to give a 10 minute tutorial on the subject, going deeper and deeper all the while.

FORBES: Delete Your Database Of Knowledge -Media Training

The worst moment for him came when he had to comment on an internal NoW email in which a news desk editor asks a star reporter to "call in those bottles of champagne" by getting Mr Yates to spill the beans about a terrorism plot.

BBC: Leveson's police grilling only the beginning