Three people give their views on the country’s supreme leader. Plus: murder isn’t the only problem for Shetland’s detectives. Here’s what to watch this evening

9pm, BBC Two
“I can’t have any opinions on this; it would be dangerous for me.” “I spit on this old man.” “The reason for all our miseries.” These are the reactions of three people living in self-exile from Iran (they could face imprisonment if they return under the current regime) when shown a photo of the country’s supreme leader, Ali Khamenei. Together they explain the mass anti-government protests that have erupted across Iran since 2009. Hollie Richardson