The system is deeply flawed, and secretive.
GP Margaret McCartney tried and failed...
"...to find out about the content of assessments, their evidence base, and the training and auditing of assessors....I wanted to know basic things. What medical criteria were used in assessments? How could the assessor—having no access to medical notes, test results, clinical opinions, or history—make a valid decision about whether the person was fit, or not, to work? Despite Atos’s services costing the taxpayer £100m a year, commercial confidentiality is given as the reason why the veils are persistently and firmly drawn."
As David Colquhoun points out in the rapid responses.. "Any private organisation that works for a public body should be subject to the Freedom of Information Act, just as the public body is."
http://www.bmj.com/content/345/bmj.e5347.full?ijkey=hCXfT1z84M6BopW&keytype=ref