MissAdventure
Well, I am intending to be a bit less submissive this time.
I have to remember my manners, and be polite, and i will be, but i will not be beaten down like last time. 
I had not seen the four posts previous to my immediately previous post to this one as I was preparing that post.
So there was a previous interview.
I am surprised at that override being possible.
I don't know what the doctor put on your sick note but my understanding - again going back to how it was - that what the doctor put on a sicknote for a patient overwhelmed by situations is Anxiety State.
Until reading your post I did not know anyone could just overrule a doctor. I think (though not certain) that in the old days even a doctor at a DHSS assessmrent could not just overide a patient's doctor, the DHSS doctor contacts the patient'doctor to discuss the patient's situation, though that might just be a professional courtesy, done in practice but not obligatory.
I am wondering if the Human Rights Act applies to the contractor. That could be a matter of legal discussion/legal argument.
The reason I say that is because UK government departments and local government are subject to acting in accordance with the Human Rights Act.
Some years ago I remember reading of an ongoing legal issue, I do not know how, or even if, it was ever resolved.
It could be a precedent relevant here.
The issue was that a Local Authority has to arrange for some people to be provided with care home ccomodation.
The Local Authority is required to act in accordance with te Human Rights Act.
The Local Authority contracted for a company to provide, for a fee, such accomodation including food and so on.
The question was Is the company therefore subject to the Human Rights Act on the basis that the Local Authority is so obliged and that it is argued that therefore the protection that the Human Rights Act gives the patient cannot be not included in how the company operates.
---
I am a bit hesitant to mention this in case it upsets you, but I looked on YouTube and searched for
Work Capability Assessment
www.youtube.com/
There are quite a lot of videos. I have looked at a few.
Some are by people from Citzen's Advice and the like.
Some are stories directly from patients of bad experiences with the assessors.
Though some are from some years ago and the assessors might have changed.
But I mention them so that it is your decision whether to look at them or not.
By the way, if an assessor says "Speaking personally, blah blah blah" just temember that the assessor is not there in a personal capacity. I know officials sometimes say things like that if they are constrained by rules not to do what they personally think. Maybe to influence you.
I did think once, that if any of them ever said that to me again I would ask them whether they think Brexit should have happened. If they then say, that's nothing to do with it, to then reply, Well you said you were speaking personally so you are therefore just some passing stranger stopped to have a chat. 