It seems to me that these people have undergone some sort of damage to their central nervous system which could manifest itself virtually anywhere in the body. Because of this, I would not expect the Ministry of Defence to admit any form of responsibility. It will demand absolute scientific proof to show that peoples' experiences in the Gulf directly caused the illness. Such proof is unobtainable. Despite many millions spent on research into MS, there is no known cause.
The Government must commit the resources necessary to find the causes, treatments, and, hopefully, cure for the condition. It must then pay a suitable level of compensation. It must not demand absolute, unquestionable proof first.