The government is facing questions over tens of millions of pounds owed to suppliers who worked on upgrades to three prisons in England.
At least 40 companies are believed to be owed the money for work they carried out in Birmingham, Liverpool and Dorset, before lead contractor ISG entered administration in September.
The small and medium-sized firms say they should have been protected because the Ministry of Justice (MoJ) promised to pay for the projects through ring-fenced Project Bank Accounts (PBAs).
But some businesses are now facing bankruptcy while others are threatening to take ministers to court. The MoJ declined to comment.



