D
Disability is widely drawn in the Act and I suspect that the employer is unlikely to contest a claim of disability if you can show you have ongoing problems adversely affecting your ability to carry out day-to-day activities.
The problem is that dismissal on grounds of incapacity to do the job is potentially "fair" if the employer can show that he is treating the disbled person no differently from a non-disabled person who, for whatever reason, is unable to do the job.
This may sound a bit Alice-in-wonderlandish, but there is an example at page 36 of the DDA Code of Practice for Employment on the EHRC site
http://www.equalityhumanrights.com/uploade...oyment_code.pdf
My understanding is that there is recent case law on this which I cannot immediately find.
EHRC seems to have a helpline 0845 604 6610 and you might also try DIAL UK, or RADAR.
Good luck.