As part of this review he has issued an invitation to all NHS workers, employers and other organisations to share with him their experiences - both good and bad - of raising concerns in the NHS or supporting others who have done so.
Sir Robert is keen to understand all aspects of the issue and to hear suggestions and ideas on what would make a difference. He is also hoping to meet with a limited number of people to discuss their contributions in further detail.
The closing date for submitting contributions is Wednesday 10th September 2014. Further information, including details of how to submit your evidence, is available on the Freedom to Speak Up website at freedomtospeakup.org.uk.