Why do some people say what they’re writing out load during exams? Even though they’re just whispering so we can’t hear what they’re saying, it can be very annoying to the other people around. Even when quietly shushed, they still whisper, presumably thinking that no-one can hear so it’s ok. It really isn’t!
perhaps you should raise this concern with ACCA. If they get lots of similar complaints, they may add it to their instruction manual that’s being read out prior to each exam.
personally i have never experienced such around me so i can’t relate as such to the concern you have raised, but clearly you have experienced it and i think it is fair that people are aware of other candidates around them truly, and behave thoughtfully.