Julie
If your original award was on the basis of the Exceptional Circumstances, then you will need to show that their is currently a substantial risk of harm to you if your were to be asked to perform Work Related Activity.
It's likely that the assessment will follow the standard script, have a look at the ESA Claim guides, there's a section at the back that covers this.
There's also a section that covers qualifying under the EC's.
Gordon
Nothing on this board constitutes legal advice - always consult a professional about specific problems