Noah
You cannot presume that the assessor is not trained to carry our a proper assessment of your problems, you may be able to show this by referencing the report with specific examples of their conclusions, that an assessor with more training would not have made but as they were a physiotherapist I would have expected them to have some knowledge of pain and it's effects.
Gordon
Nothing on this board constitutes legal advice - always consult a professional about specific problems 
