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Their joint FAI heard that both inmates were vulnerable while at the facility near Falkirk and Sheriff Collins - who presided over both inquiries - made 25 recommendations including for the prison service to make definite and practical steps to make cells safer.

An FAI is a legal requirement for any death in a Scottish prison.

The Allan family are also calling for a change in the law to address Crown immunity - which protects the prison service from prosecution - as well as reform of the FAI process and improvements to legal aid.

The FAI into Katie's death heard she was vulnerable and had a history of self-harming which Polmont prison staff were not aware of.

The FAI heard that Katie struggled in prison.