I think it's crazy that girls under 16 can show up at a family planning clinic or their GP alone and ask to be put on contraception without their parents permission. I'm pretty sure it hasn't always been that way and you needed your parents permission at one point.
My DD is only 10 but it scares me that in just four or five years she will be able to go on the pill without telling me or needing my permission.
I just think that if my teenage DD is going to be using something hormonal like the pill or implant or injection then I'd want to know so I can keep an eye on her and also be on the look out for any bad side effects she may have. Some women have a terrible time with hormonal contraception and I just think that when you're young having someone else keep an eye on you is a good idea iyswim.