Hi Naomi ,
that is a bit of an odd situation and it is good that you have a Union to use .
Maybe an odd situation if the interviewers already know your History ... however i would imagine that they would still have to use the Equality Act 2010.
See here
Direct.Gov...recruitment questionsThis basically means that they cannot ask questions about your health or disability until you are offered a job or are in a pool of people to be offered a job.
Have a look at the link above and if nothing else , it will give you a guide for questions to raise with the union.
With regard to ill health retirement , as you know from posts on here it is a nightmare to get , so might not be an option anyhow, and in this current climate of benefit cuts , you might not be considered disabled enough to qualify for any help in the future .
Good luck with this and obviously let us know how it goes
Rich :)
"The difference between 'involvement' and 'commitment' is like an eggs-and-ham breakfast: the chicken was 'involved' - the pig was 'committed'."