 DUBAI Reuters - British-Iranian relations, which have been strained for decades, were back in the spotlight after Iranian authorities executed British-Iranian national Alireza Akbari for spying, charges he had denied. Here is a timeline of main bilateral developments since the 1950s: 1953 - Britain and the United States help orchestrate the overthrow of popular Prime Minister Mohammed Mossadegh and restore Shah Mohammed Reza Pahlavi to power. 1979 - Islamic Revolution overthrows the U.S.-backe... 