Belle is 15.

I made her wait until she was 12 for ear piercing, I wouldn't encourage anything else.
She wanted to dye her lovely blonde hair black - NO WAY! She had blue foils in over the holidays when she was 13, but I made her wait until she was 15 to dye it. I do it for her, and she has to maintain it. No black as it looks revolting, and no crap roots - she must pay for it herself. I have to admit when I relented on the hair dye - a nice brown actually suited her better! I pay for a good cut. No way is there to be bad hair. I'm not a barbie doll, but there's no excuse for ratty hair (or white "court shoes").
I showed her how to use a razor at 13, she can do whatever...

You all probably know my stance on drinking and smoking.

I swear like a trooper myself, but I always pull her up on it if she does. The occasional s word when you stub a toe, or a-hole to describe a boy is ok, but I don't want it to be part of her everyday vocab.

supervised outings at night, big groups of friends during the day and mummy ALWAYS knows where she is.