Hi all after several weeks of endless phone calls & emails to my vets,  I can now confirm that the pathologist who performed my dogs autopsy & diagnosed him with NCL which I disputed, have now been in contact with top expert of NCL in the USA.
The USA Professor is just waiting to receive brain & spinal cord samples now, hopefully I should have a diagnosis soon, as you will all know from my previous posts, there as been no evidence of NCL in Rottweilers, & I have always stated my dog was in fantastic health until he started the last course of Rimadyl.
It as been a long battle ( several months now) to get the correct diagnosis, will keep you all updated.