Survey finds 97% of family doctors deliberately prescribed a useless or unnecessary treatment
But Cameron's health tsar is more positive, saying new culture can make NHS the world's safest
David Cameron has consistently backed embattled NHS chief - but his support may now be 'wavering'
Embattled health service chief says politicians must take blame for 1,200 who died in Mid Staffs crisis
Health Secretary says 30,000 die each year because British health care fails to match best in Europe
Doctors' union claims a weekend health service is 'catering for the convenience of the middle class'
Leading surgeon claims NHS is taking a 'Stalinist' approach to silencing critics of health standards
New investigation into care at UK hospitals ups pressure on beleaguered NHS chief to step down
Francis inquiry into NHS scandal blames culture of targets and urges hospital staff to admit mistakes