In short yes it is a requirement of the AQA for all approved centres to have formal plan in place that covers any emergency, bad weather , mass staff sickness, fire, flood etc. Including placers to act as temp approved centres and how staff will be deployed to allow exams to run. Such plans have to be available for inspection by the AQA inspector who calls each year during the summer exams which as from this year will be multiple visits. In fact last year we got ask for ours.
I’ve over seen exams all over the place due to illness , sickness, being pregnant , floods and fire. Not to mention the about of time and planning we do to get some candidates to school to sit an exam in the 1st place.
A centre can ask for an exam to be held another time but the AQA have to be sure a delay wouldn’t effect the exams begin held elsewhere. The same exam happens across the county at the same time. So if one school is closed and one open down the rd then you’d have a hard time getting the ok to move it to another day. Unless you can show without doubt that they have not seen the paper or asked a mate about it.
If school had to get pupils it will be all in the plan. AQA could call off the exam all round but that will neeeds a number of duck to be in a row. It wound only take one packet of papers to be opened to put a spanner in it.
Exams are quite complex I can’t give you formal wording covering this stuff as I don’t have a copy of the yellow book at hand. Rules also cover arriving late and sitting exams so if it’s only one or two that can’t get in a time they have basically up to the very end of the paper to make it in. The start time can be delayed by the centre if needed up to a point just need a few phone calls to AQA to work somthing out and the right paper work filled in.