We only have your side of the story and it would interesting to hear their's.
Redundancy selection can be based on a range of criteria and it is perfectly possible that the employer has arranged the criteria to make it easier to include you in the pool. That initself isn't unlawful.
However it is somewhat strange that the redundancy is apparently linked to whether the insurer continues to pay your salary - that sounds a somewhat dodgy criterion - might be useful to have something in writing that implies that.
Disability discrimination applies to those with a registered disability - I assume this doesn't apply to you.
I'm no longer up to speed on the law on making allowances for those with an impairment - it does however depend on whether the condition is expected to improve over time or whether that's it for life.
You can't bring a case for unfair dismissal until after you have had a notice of dismissal. Then you talk to the Employment Tribunal people here.
http://www.direct.gov...nttribunals/DG_176137
You use the ET1 Form.