On Press Freedom Day, this special report for Defence Viewpoints by Kasra Naji, BBC News Persian
It's the looking over one's shoulder to see anyone is following. It's not all the time but more often than I'd like to admit. When leaving the BBC's office in central London, and heading home, I look around for suspicious looking men lurking around. In the underground, I rarely stand close to the edge of the platform. I am paranoid about not sharing my home address. I have asked my child not to put photographs online.
"As Napoleon said, to know a nation's geography is to know its foreign policy."