My Dad worked in the health service all his working life and always says that Doctors are a totally closed shop who will protect each other no matter how obvious an error has been.
This story is an example:
http://www.freedomforall.net/2006/11/why-not-simple-negligence.html
Regardless of whether there has been any negligence, the doctors involved ar ebehaving in a way which seems more to do with self preservation that getting to the truth and actually putting right any wrong.
