Solitary confinement to stop virus spread increases risk of self-harm and suicide and could have a lifelong impact, M0J warned

• ‘Just 15 minutes out every day’: a teenager prisoner’s life during Covid

The UK government’s policy of allowing children in detention to be locked alone in their cells for up to 23 hours a day under emergency Covid-19 measures is “extreme and inhumane” and could lead to lifelong mental health damage, according to the UN special rapporteur on torture and leading child health experts.

Since March, facilities have been able to keep children as young as 12 confined alone in their cells for all but around 40 minutes a day. The measures, which were put in place to stop potential Covid-19 outbreaks, affect around 500 under 18-year-olds in youth detention and another 4,000 18-21-year-olds held in adult prisons.

One young inmate tells how being locked up alone for hours and not being able to see his family affected his mental health

• UK Covid policy for children in detention ‘cruel and inhumane’, says UN expert

For five months, 16-year-old Sean* spent around 23 hours a day in his cell. He tried to get through the time by doing puzzles and calling his lawyer, asking her again and again to help him get bail.

When he arrived at the secure training centre (STC) it was already in lockdown. He was just 15. “I had to go into total isolation for the first two weeks, just 15 minutes out every day. It was my first time in custody and at first I thought this is OK, it’s a chance to slow things down. But after two weeks it began to affect me. You couldn’t do anything. I could hear voices calling on the wing, but I only saw the guard.”