My first Saturday job paid 10/- and I was still there when we went decimal and then I got 50p. Eventually the Manager realised that some Saturdays I was on my own in the department and was even counting the till when there was no one else there, and so he put it up to one pound, which was what all my friends in the other shops were earning on their Saturday jobs.
I must have left when I left school - but I remember another girl who worked there (a regulare employee, not a Saturday girl) who would buy herself a 45 rpm every week and I'm sure she said they cost 12/6.
When we were very young (about 1959-1963) we would be given thruppence to spend on sweets at the village shop and you could get quite a bagful, as some cost a farthing, and some cost a ha'penny. We would sometimes get one of those 1d bars of chocolate for the cat, who loved them.