My DD is 13 and gets £13 a month. It's not linked to chores but I do expect her to pitch in as part of the household. She empties the dishwasher, puts washing on occasionally, and cooks tea around once a monthweek. She's meant to keep her room clean, but limited success there!
There are other big jobs that I would pay her for eg washing the car, mowing lawn, cleaning bathroom. She hasn't done any of them for ages though.
She gets tons of bday and Christmas money from extended family, and it tends to last her through the year for anything she wants. She buys most of her clothes, but she's really not that into fashion so she doesn't buy much. I buy all school clothes, coat & basics eg a couple of pairs of jeans and a couple of hoodies each year.
Her phone & 2 yr contract was her main birthday present, so I pay for that. I'll probably do the same when it runs out on her 15th birthday.
She also gets £12.50 a week dinner money which if she gets a meal deal leaves her about £3 a week for sweets at the shop. If she needed anything like deodorant or smellies I'd buy it at the supermarket but she mostly gets them as presents from friends anyway.
Over the last two years she saved up all her pocket money, Christmas money and birthday money, and did some jobs around the house to earn extra. In January she bought herself a KitchenAid!