James is right in his comment on the last but one posting when he says certification bodies profit from the relationship. 

In my opinion, though, this can be a good thing.  The bad old days  of the assessor as enemy trying to trip you up are long gone.  The certification bodies have now by and large grasped the fact that they are certifying their customers and generally try to build a constructive and supportive relationship with the businesses they certify.  And as a last resort, if yo are not happy with the assessor you are allocated, you are entitled to ask for a replacement.