An investigation into shamed GP Peter Green, who was jailed for eight years for sexually assaulting patients, is expected to call for changes to NHS complaints procedures and moves to strengthen GP accountability.

The Commission for Health Improvement, which was brought in by health secretary Alan Milburn to investigate the case, is due to publish its report today.

Dr Green, of Oakham, Rutland, was described by the judge as being an 'utter disgrace to a noble profession' when he was sentenced in July last year for assaulting nine male patients in his Loughborough surgery.

The jury had been told that he had taken semen samples from them, though the samples were not being required for any legitimate treatment.

CHI's report is expected to call for changes to the complaints system, claiming that too many complaints were dealt with in isolation. It will call for action so that organisations pick up patterns where a number of complaints are made against the same person.

It is also expected to urge bodies to examine whether a complaint is an indication of wider problems with the person concerned.

It is understood that the report will describe current lines of accountability in primary care as 'unclear', and call for changes to strengthen the role of commissioning bodies in their dealing with general practice.

The CHI report is expected to add weight to criticisms of GPs' status as independent contractors, but will not go so far as to demand an end to the system.