Hello my name is ***** ***** I will help you with this.
Could you please explain your situation a little more?
Is it lawful - yes it is. That is because the government prescribed it and said that they can do it. So yes, it is lawful.
However if they find against you, then you can appeal to a Tribunal.
They are independent of the DWP and you can get your own medical evidence to support you.
But at this stage, it is legal, because you have a right to appeal.
I am sorry if this is not necessarily the answer you want, nor the one I want to give you, but I have a duty to be honest.Can I clarify anything for you about this today please?