Alexander - I hope your DH is OK and recovers quickly 
hmcAsWas - the more I learn about the whole GCSE process- the question-setting (wrong questions, badly worded questions etc), the control of papers (& leaks) and the marking /review process, the more I become convinced they are basically a useless tool and indicator of very much.
Most of the exam boards seem to struggle to recruit markers as they pay rather poorly and most teachers prefer to have their summer holidays! I've also seen some recruitment ads for markers where the criteria is very low or rather vague e.g. have taught in the last three years, but not necessarily the relevant syllabus 
I'm so sad that our young people invest so much of their time into these exams and then are not even given the respect of a well-managed and fair process 
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Interestingly, the Head of DS's (independent) school has, in the last few years, started publicly telling the students that:
a) GCSEs are important, but not the 'be all & end all'
b) You should do your best, but they're not worth making yourself ill over
c) if they go badly it's not the end of your life - there are always resits, A levels and other opportunities to prove yourself in the future.
Unfortunately DS only took away and remembered/repeated the "they're not that important" part of the message 