I have recently published a PhD thesis, which may be useful to those interested in complaints handling in the NHS (the conclusion contains a number of policy recommendations with regard to the role of complaints managers).
The title is:
NHS Complaints Managers: A Study of the Conflicts and Tensions in their role.
For anyone interested in reading a sample/ the contents, it is available in E book format from dissertation.com:
http://www.dissertation.com/book.php?method=ISBN&book=1581122683