I would say 100% is “good”. Anything less is not so good.
But, as woofgang suggests, there seems too much reliance in Mr Platt’s argument of what percentage of attendance constitutes “good” or “regular”. All children (even sunny-dave!) will need time off school now and then for illness or injury. There could also be a case for allowing a short time off for bereavement if the deceased is a close relative or domestic emergencies. Schools understand and accept this. What they should not have to understand and accept is that parents deliberately remove their children from school to go on holiday for a week or two.
None of the arguments put forward in earlier threads on this matter are sound. I have heard “parents cannot get time off in school holidays”, “clashes with school holidays where other siblings attend”, through to the preposterous “it’s too dear”. None of these have suddenly happened (and even if they had, it’s too bad). Then there is the ridiculous notion that a week in Disneyland or Benidorm is somehow more educational than a week in school. Parents have an obligation to ensure their children attend as and when required by the school. The idea that “it’s only a week – it won’t do any harm” is self-centred. It may not do any harm to the individual (but I dispute that, having been forced to miss about eight days in a row when I was thirteen due to injury). But a school which has pupils coming and going seemingly at will because, according to Mr Platt, their parents know best how to raise them (which includes choosing when to send them to school), will be a school that struggles.