I don't quite get why OP is getting such a kicking on this thread, or why everyone is paying so little attention to their dad's right to make decisions about his own kids in the time he has them!
But what really puzzles me is how little everyone gives their kids!
I understand if money is tight, you can't afford to give them much and that's fair enough. But it sounds like a lot of you just don't believe in giving kids much spending money, even teenagers, as a point of principle. Can I ask why?
I saw one lady suggested £4.55 for a 13 year old. My 13 year old isn't a social butterfly particularly, but I would say she goes out with friends on average once a week, I think that is normal! If she only had £4.55 a week that would basically be gone at McDonald's or wherever they go for food/drinks when she sees her friend.
It would take her two weeks of no spending to save up for a book.
If she wanted say a t-shirt from HMV or something, she would literally have to save and spend nothing else for over a month.....
People mention spending £20 on sweets or toys - but teenagers don't, do they? They go out with friends, they buy books, music, clothes, makeup. All normal healthy teenage expenses.
I just don't understand how your teenagers are doing life on such little amounts? Maybe you prefer to buy them most stuff yourselves?
But that isn't giving much autonomy or teaching them much about budgeting and money.