The public sector needs to compile a ‘Domesday Book' of all public service outsourcing contracts and appoint an ‘invigilator' to review the dodgy ones, a new report has suggested one week after infrastructure giant Carillion collapsed into chaos.

Written by former leader of Bedfordshire CC, John Tizard, and former director of the Audit Commission, David Walker, the Smith Institute think-tank report stressed that many contracts between public bodies and private partners were ‘shrouded in secrecy'.