The family of a British couple serving a decade-long prison sentence in Iran are sounding the alarm after losing all contact with their loved ones for more than a week, according to a report by Sky News.

The situation, already grim by any reasonable standard (a 10-year sentence in an Iranian prison is not exactly a Club Med holiday), has taken a darker turn as relatives say they have been completely cut off from communication. No calls. No updates. Nothing.

What we know

According to Sky News, the family of the jailed UK couple has publicly expressed growing concern over the sudden and prolonged communication blackout. While the specifics of the couple's case have not been fully detailed in the available source material, the broader context of British nationals being detained in Iran is well-documented - it is, unfortunately, not a rare occurrence.

Iran has a controversial track record of detaining foreign nationals, including dual citizens and passport holders from Western countries. Human rights organizations have repeatedly raised concerns that such detentions are used as political leverage - though Iranian authorities dispute this characterization.

Why the silence is so alarming

When you're already staring down 10 years behind bars in a foreign country, the one lifeline keeping your mental health (and your family's sanity) intact is communication. Losing even that is, by any measure, deeply distressing.

The family's public appeal suggests that official diplomatic channels may not be moving fast enough for their liking - which, given the notoriously slow pace of UK-Iran diplomatic relations, is saying something.

The bigger picture

The UK and Iran do not have what you'd call a warm diplomatic relationship. The two countries have clashed repeatedly over detained nationals, nuclear negotiations, and a whole buffet of geopolitical grievances. Progress on individual cases tends to move at the speed of a very tired glacier.

What happens next remains unclear. But if the family is going public with their fears, it's a safe bet that behind-the-scenes efforts have not produced the reassurance they were hoping for.

Sky News is continuing to follow developments on this story.