I don't see why they should change your actual grade. I can understand a university looking at you more leniently, that is fair enough, however if you took a maths exam and got 75 UMS i do not think it is fair for them to then give you 80 UMS, because that is not what you achieved. You have a reason for not achieving it, which should be taken into account by the universities, but i do not think you should suddenly receive more points as if you'd answered more correctly. I know i am not an examiner but i think if you receive an A and you actually only got a B, then the whole system is devalued.