Hi Fel1x, I am just doing DD's renewal, so am on part 9 - it's like pulling teeth 
Tips...
Have you got the cerebra guide? It is excellent.
Basically, first thing is to remember that the decision makers are not medically trained. They don't have SN experience. They just have your form, and a 'Decision Makers' guide' along with a Manual of Medical Conditions, which tells them what to expect for various conditions.
So, you have to be ABSOLUTELY EXPLICIT. If you give your DS medication, you need to describe what you have to do (ie. crush tablet, dissolve tablet, draw up syringe, etc), what steps you need to take to persuade him to take it, how long it takes, how often you have to do it etc.
Don't feel confined to the spaces they give you. Use Microsoft Word to type your answers and then if they don't fit, write 'see additional sheet'. Make sure each additional sheet is clearly labelled with Name, date of birth, NI No, Question No. etc.