What goes on inside Yarl's Wood?

The prisons watchdog has described Yarl's Wood immigration detention centre as a "place of national concern".

There are 12 centres like it in the UK - Yarl's Wood is the one for women - but the media is not allowed access to the facility.

However a charity called 'Yarl's Wood Befrienders' are allowed to go in to meet the women facing deportation.

These people have shed light on one of the most secretive places in the UK for a new play called 'The Scar Test' as Catrin Nye reports.