I am presuming that you are worried that your company will try to suggest that you have colluded with your answers and subsequently they will have grounds to suggest that you are being less than truthful? My thoughts are that it does not matter, if what you have said is true it should not make any differerence to how it is laid out or what has been raised. I do not have any legal experience to help you, but your union should and they should be able to point you in the direction of their legal employment advisors. I would ask to speak to them urgently to better understand your position.
Hope this has been of some use, I too have had to go through a nasty disciplinary procedure some years ago, where I was subsquently unfairly dismissed from the company that I was working for. I had the backing of my union, but my rep was useless and allowed me to be bullied by my manager who was screaming at me in the disciplinary meeting (he should have called an immediate stop to the meeting and got me out of there). The company also did not follow correct disciplinary procedures in my case and the end result was that they paid me off to stop me taking them to a tribunal. The whole experience was very stressful, so I can very much sympathise with what you are going through. An important point to remember with all of this, is to ensure that your company has followed correct procedure all the way through, if they do not you could have automatic grounds to win any appeal just on this basis.
Best of luck, keep us informed as to your progress.
Sue