From my perspective, it's reasonable for UK government to do so. Taking children out of school for holiday during term time will definitely lessen their interests for study, which will literally be a threat to the UK education level. We are supposed to know there is a distinction between authorized and unauthorized absence. It's obvious that term time holidays belong to the latter one. Nothing can be accomplished without standards. Hence, proper punishments should be given to guarantee the efficiency.
It's quite common for parents to take their children for holiday. However, it should be done in a more proper way. We can't avoid the severe fact that some families do have to strike a balance between money and holiday. Nevertheless, there are effective ways helping thos parents get out of the dilemma. Parents can choose to take children to some spots that won't cost much or they can work harder to earn more money. However, each method is not supposed to sacrifice the children's education.

