A colleague said that her child (age 7/8) gets a lot of money from relatives for her birthday and Christmas (no idea how much) and when she takes her shopping to spend it she says to treat mummy to a Costa.
I know a Costa is like £5-£8 so not a huge amount but that seems like an amount that would mean something to a child. I don’t know .. I just wouldn’t expect my child to pay for anything at that age.