Speaking as a parent and a former teacher (my DW was also a teacher until our car accident) I think the problem with this whole situation is people taking their kids out too often, for too long or at bad times that has led to the "fining parents" mentality.
We have (and will this year) pull our daughter out for a week. We go to WDW for 2 weeks and we make our trips coincide with one of the half term weeks. We didn't have this luxury when we were teaching!
Parents should be allowed to take their children out for up to 10 days without being fined in my opinion, but it should be a once a year thing and should not coincide with important school events, such as exams, exam prep, or in the case of secondary age kids, during their GCSE years. If all parents stuck within these parameters, then I don't think the fining thing would be needed.
I had students who were pulled out for 2 weeks at a time, several times a year and missed vital work. From a teaching perspective, this is a huge problem. However, if parents act responsibly, then should be no reason why head teachers could not approve holidays in my opinion.
Speaking as a parent, paying the £100 fine to save £1000 on your holiday cost, is totally worth it!
