@Yacka
My kids had yesterday off as they were exhausted and with the heat couldn't sleep or focus.
As a teacher with a particular responsibility for attendance, I can absolutely guarantee that the school would not have been understanding of this at all- it is, to be honest, utterly pathetic and is not teaching any ounce of resilience to your children, and is just incredibly damaging long-term.
Sorry to be so blunt- I know you want your children to be happy and healthy, as every parent does, but it's really important to realise that one day of comfort resting at home because they 'don't feel up to school today' is a huge price to pay for the long-term outcomes, and as parents we need to consider what is best for our children overall, including the future, not just that one morning. Those outcomes include lack of resilience, poor work/life balance, difficulty in a work environment, not to mention the absolute and massive link between lower attendance (even just a bit lower) and significantly lower GCSE results.
Each time your child misses school, think about the number of hours in lessons (a typical school would be 5 x 1 hour lessons each day). Do you genuinely make your child do 5 hours of catch up work every time they skip a day? Highly unlikely, and even if you did it would likely be less effective than actually being in school.
Feeling tired, unfocussed, sore throat, tickly cough, tummy ache etc are NOT reasons to stay home and jeopardise their learning (and, therefore, their future).
Harsh but fair, I'm afraid 