Over the last half century the television interview has given us some of TV's most heart-stopping and memorable moments. On the surface it is a simple format - two people sitting across from one another having a conversation. But underneath it is often a power struggle - a battle for the psychological advantage.

The most important advice you can give anyone about to appear on TV is incredibly prosaic - be yourself.

If you don't have the smoking gun, then it's pointless to hector interviewees. Because you just shut people up instead of opening them up.

David Frost Quotes