why don't they just stump up the £10
Why should they have to, when it is a safety issue?
Agree with everything you say though about families and the obscene amount they spend on junk food, etc, when they are already overweight and don't do enough excercise, and let their kids have mobile phones, and TV in their bedroom when they are too young and don't discipline them enough and then they turn into yobs who smash up phone boxes and mug old ladies ...
... but that is not really the point here (in my own very humble opinion!)