Iran is top of mind for many ‘danger tourists; this week, after British couple Craig and Lindsay Foreman were detained by Iranian authorities on espionage charges.
A statement issued by the Foreign Office on their family's behalf, said: "This unexpected turn of events has caused significant concern for our entire family, and we are deeply focused on ensuring their safety and well-being during this trying time."
The FCDO might advise against all travel, or all but essential travel to parts or all of an area.
The couple, in their early 50s, who were on a trip across the world on motorbikes, were arrested in January but the news emerged on Thursday when state-run Iranian media reported they were being held on unspecified security charges.
A photograph was published of the couple, with their faces blurred, meeting the British ambassador Hugo Shorter at the public prosecutor's office in Kerman.